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Are Ductless Minisplits Overpriced?

An installer’s estimate has one homeowner wondering whether he should install the unit himself

Posted on Apr 3 2017 by Scott Gibson

Ductless minisplit heat pumps have received a tremendous amount of attention in the last several years, and Peter L. would like to include one in his own house. There's only one problem: an estimate that seems far higher than it should.

"I was quoted $4,800 to purchase and install a Mitsubishi Mr. Slim 1-ton unit (MSZFE12NA)," Peter writes at GBA's Q&A forum. "That seems very high. Especially since it's a new build and the 3-inch hole is already in the wall."

Installers see minisplits as a niche market, Peter says, and because they're not making money on the ductwork that a conventional heating and cooling system would require, they are charging "crazy install prices" to make up the difference.

In this case, Peter estimates that the installation should cost about $500, not the $2,000 his contractor has in mind.

That makes installing the system himself an attractive option.

"I might go the route of the DIY minisplit from Home Depot — Mr.Cool," he says "I can get a 1-ton unit for $1,300 and install it myself since the refrigerant lines are pre-charged. The Mr. Cool unit (17 SEER(SEER) The efficiency of central air conditioners is rated by the Seasonal Energy Efficiency Ratio. The higher the SEER rating of a unit, the more energy efficient it is. The SEER rating is Btu of cooling output during a typical hot season divided by the total electric energy in watt-hours to run the unit. For residential air conditioners, the federal minimum is 13 SEER. For an Energy Star unit, 14 SEER. Manufacturers sell 18-20 SEER units, but they are expensive. ) is not as efficient as the Mitsubishi (26 SEERSeasonal Energy Efficiency Ratio (SEER) is the total cooling output (in BTU) of an air conditioner or heat pump during its normal annual usage period divided by its total energy input (in Watt-hours) during the same period. The units of SEER are Btu/W·h. SEER measures how efficiently a residential central cooling system operates over an entire cooling season. The relationship between SEER and EER depends on location, because equipment performance varies with climate factors like air temperature and humidity.) but at $1,300 for the 1-ton unit that cannot be beat. Even if it dumps out at 7 years of age, I got my money's worth."

Smart plan or not? That's the topic for this Q&A Spotlight.

You're paying for less risk

The question has come up before, GBA senior editor Martin Holladay points out, when Justin Fink, the editor of Fine Homebuilding magazine posted a question about installing a minisplit himself when he renovated his garage shop. That was back in 2013.

"If you pay for installation by a qualified contractor, you are paying for warranty service and future callbacks," Holladay adds. "You are also ensuring that Mitsubishi doesn't void the equipment warranty because of an installation error."

Ben Balcombe suggests there's more to a higher-than-expected estimate from a small company than Peter might realize.

"Like many, I've been through these thoughts and discussions about how an $1,800 unit can cost $4,000 installed," Balcombe says. "Personally, I work for a company that employs [about] 20,000 people, so I have no experience in the costs of running a small business, but when you actually step back and think about all the costs that a small HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. company has to incur, you quickly get to big numbers."

That includes wages, taxes, real estate, the purchase and maintenance of work vehicles, training, liability insurance, and medical insurance.

"All of that is included in the price," he says. "It's not that Bobby HVAC is pocketing $2K for a couple of hours' work that you could do yourself. If I was working out my budget for a project I would look to do the 'easy stuff' myself (framing, painting, basic plumbing, and electrical) and use what I save there to pay for a pro to install a minisplit."

No, $2,000 is way too much

To Tim Brown, who runs a small business himself, the $2,000 installation charge is way too much, and reflects a belief in the HVAC community that minisplits are a "cash cow" not unlike photovoltaic(PV) Generation of electricity directly from sunlight. A photovoltaic cell has no moving parts; electrons are energized by sunlight and result in current flow. systems.

"What I'm finding with the minisplits (at least in northwest Ontario) is [they] are new, exotic, and well outside the comfort zone that most of the companies work in. The attitude is Hey, if you really want that fancy new unit, you gotta pay whatever I ask. It is particularly true when there are only a couple of companies that have ever touched a minisplit.

"I have to pull the trigger this summer on a minisplit and will install it myself before I pay what I consider a predatory rate to have a 'pro' do it," Brown continues. "I can buy two units: screw up the first one/throw it away and get another for the cost of one professionally installed unit."

When Brown runs the numbers, he comes up with no more than an eight-hour day, and that includes an hour to test the system and have a cup of coffee with the customer before leaving. At most, $1,000 ought to cover it.

"Just throwing that our for discussion," he says.

Brown's claims ring a bell with Steve S., who writes that the oversized effort to get a minisplit installed in his house was simply too much.

"I had five different contractors look at our project — a 1,500-square-foot, two-bedroom Cape Cod that I had just spray foam insulated, which I thought was a perfect candidate for a minisplit system, and all of them talked about how it would be better to install traditional HVAC," he writes.

"I gave up on the minisplits."

The answer depends on system complexity

Jimmy Black says he's probably saving a couple of thousand dollars by helping a local contractor install a 3-ton, two-head ductless Midea system, but the potential savings of doing the whole job himself weren't that enticing.

"I priced doing the system myself, but by the time you add up all of the ductwork (I have some custom pieces), lines, and time involved I was well into $4-$5,000," Black writes. "Not to mention that simply troubleshooting any problems is going to cost you big bucks, since you have to evacuate the whole line set for many issues. Expect $200-$400 per service call.

"I'm spending the extra to make sure it's done correctly, but mostly to have a 24/7, no questions asked, 10-year warranty."

If he had installed the system himself, he might still be covered by the manufacturer's warranty, but then had to ship a defective unit back and wait for a replacement to arrive. "In Florida, 2-3 weeks without AC is not an option," he adds. "I also wish to never again mess with maintenance after my renovation is done. I'm ready to relax!"

That said, if you're installing a small, simple system — one outdoor unit and one indoor unit — do it yourself, Black says.

"If you have multiple zones, you can still do DIY," he adds. "Do several 1/1 units. That way if something goes wrong, only the one head is offline, and it will be much easier to troubleshoot, and if all else fails simply replace the unit."

The installer is offering an outdated unit

Dana Dorsett checks the details of Peter's original post and offers this thought: the Mr. Slim minisplit included in the quote is a 10-year-old model that has been discontinued. "You don't want it," he says.

A new model, Mitsubishi's FH12NA, "has a significant efficiency advantage over the FE12, which would only be sold by third-party remainder and surplus houses these days, not standard Mitsubishi distributors, though you can still get repair parts for them," Dorsett says.

Dorsett says that in his area, the FH12 would cost about $4,000. "I'd only consider installing an FE12 if it came in under $3,000," he says.

"If you're using it primarily for AC, note that the FH tests a SEER 26+, whereas the FE is SEER 23, which is still a double-digit percentage difference, if not quite as much as the heating efficiency delta," Dorsett says. "Of course, unless you did an aggressive Manual J — well enough to have a real handle on the heating and cooling loads — there's no way to know if either of those models is appropriate for your house/zone."

Wait a little longer, an anonymous poster tells Peter, and you'll be able to buy an even more efficient Mr. Cool minisplit — and one that includes a warranty for DIY installation.

"The Mr. Cool DIY series comes with a warranty for DIY," the poster says. "And by the way, minisplit costs about $50 (US) to install in China. You can get in the U.S. a Midea 24,000 BtuBritish thermal unit, the amount of heat required to raise one pound of water (about a pint) one degree Fahrenheit in temperature—about the heat content of one wooden kitchen match. One Btu is equivalent to 0.293 watt-hours or 1,055 joules. /h unit for $1,300, 20 SEER. Oh, Midea [has] got a 40 SEER (yes, 40 SEER) unit coming out this year, and it should be dirt cheap, too.

"More kids should get into the HVAC business instead of college," the post adds. "Easy money."

Our expert's opinion

Here's what GBA technical director Peter Yost thinks:

I checked in with a local high-performance HVAC contractor, ARC Mechanical, on the issue of affordable installation of simple ductless minisplit heat pumps. ARC completed approximately 150 minisplit heat pump installations last year, many of them for single-family homes. Alex Wilson in our shop recommended I talk with Mark Russwick, the guy he worked with on the HVAC system in his own home.

Mark started off by saying that he admires anyone who likes to take on technical challenges on their own home. “It’s the Yankee in us, and I include myself this way,” said Mark. “But I think there are good reasons to go the pro route on minisplit heat pump installations, and in fact, the $4,800 total cost is not that far off the mark.”

Here is what Mark laid out for me in our interview, in a really clear way:

  1. You need a vacuum pump. Even if the compressor and the line set come charged, you will need to purge the interior head, which will not come pre-charged. And if you don’t ensure that the entire system is pressurized with just refrigerant, you run the risk of inefficient operation and probably damage or reduction in service life of the compressor.

  2. These are relatively new systems and certified training ensures a warrantied install. ARC is an elite Diamond installer for Mitsubishi Electric, which means all of their installs have a 12-year warranty. “The trainings are important because these are high performance systems and the field is changing and improving really fast. Tough to stay on top of the game,” Mark stated.

  3. The cost of equipment is about $1,750. Mark showed me an actual invoice for a Mitsubishi 1-ton, single-zone, Hyper-Heat, including the compressor, indoor head, line set, controllers, concrete pad, and 18-inch compressor stand.

Mark also showed me a spreadsheet that ARC had worked up for Green Mountain Power for ARC to complete about 200 projects. So these are quantity-discounted costs. The install included:

  • $150 line hide, including wall inlet, two straight sections, one coupling, one end outlet, spray foam, and caulking for a standard 30-foot line length.
  • $60 control wire and drain, at $2 per foot.
  • $1,280 labor — two guys, five hours each at job, including travel time.
  • $725 electrical work — 240-volt 20-amp wiring 50 feet to panel, and including code-required exterior GFI duplex service outlet (labor and materials).

The total cost, Mark said, is “right around four grand.

"Given the quantity-discount in our numbers and the fact that our labor rates might be lower than your GBA poster (Pacific Northwest), not as far off from $4,800 as you might expect,” he said.

Finally, I checked in with mechanical engineer Bart Bales and he added an interesting perspective:

“One consideration for all types of heat pumps is the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) standard test for performance conducted at 47° F. Organizations such as the Northeast Energy Efficiency Partnership (VEEP) and the Vermont Energy Investment Corporation (VEIC) are advocating for testing and Output/Coefficients of Performance (COPEnergy-efficiency measurement of heating, cooling, and refrigeration appliances. COP is the ratio of useful energy output (heating or cooling) to the amount of energy put in, e.g., a heat pump with a COP of 10 puts out 10 times more energy than it uses. A higher COP indicates a more efficient device . COP is equal to the energy efficiency ratio (EER) divided by 3.415. ) for temperatures of 17° and 5° F.”

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  1. Scott Gibson

Apr 3, 2017 8:03 AM ET

$4.8K is still too high
by Dana Dorsett

Just about 5 years ago a relative of mine in western WA had an FE18 installed by a Mitsubishi Diamond installer for less than that. That's a bigger and more expensive unit , and it was still a current model when installed, unlike the current quote for installing the now discontinued FE12, (It was not the newer and substantially more efficient FH12.) Even if it was the FH12, $4.8K would be on the high side for an installation in the PNW.

That said, in the past couple of years I've seen ridiculous proposals for inappropriate equipment at inflated for Mitsubishi equipment from Diamond installers in my area from sales-droids who seemed clueless about how to size them, as well as spot-on equipment selection at competitive pricing (also from Diamond installers.)

Even if the warranty is good for 12 years, it's not worth paying extra for out of date equipment of lower efficiency. Independently getting a handle on the load numbers and specifying the equipment yourself, then putting it out to competitive bidding seems to be the best strategy in my area, but it requires a fair amount of self-education (or input from competent people.)

Apr 3, 2017 8:46 AM ET

I see the headline...
by Martin Holladay

"Most Ductless Installers Clueless, GBA Reports"

Apr 3, 2017 9:38 AM ET

Edited Apr 3, 2017 9:40 AM ET.

stepping over dollars to pick up pennies
by Fortunat Mueller

As Mark R says in the article, you cannot properly install a mini split heat pump without properly evacuating the line set to eliminate all air and all moisture from the line set. This requires a high quality vacuum pump and depending on the install and the time of year, the process can take between 2 and 4 hours when done properly (triple evacuation with dry nitrogen purge in between). If you skip this step, the system will kind of work initially, but efficiency will be low and you are likely to have premature component failure as the remaining moisture in the line set will contaminate the refrigerant and compressor oil.
For those interested in the effects of install quality (even among "professional" installers) I highly recommend the recent report "Ductless Mini split heat pump impact evaluation" authored by the Cadmus Group for MA and RI. On page 104 of that report, they include the interesting finding that a lower quality reduced COP by as much as 0.7-1.0 when compared to a proper install. So even leaving aside the likely shorter unit life, it is pretty clear that a 'cheap' install usually isn't 'cheap.

Apr 3, 2017 10:37 AM ET

does cheap have to be incorrect?
by Graham Allan

Some of the implication seems to be that a self-install would simply omit evacuating the line set properly, but that's surely doing a disservice to people who are truly interested in learning how to do a job correctly. It seems that most people posting here are obsessive enough to fall into that category! Equipment such as an a/c vacuum pump isn't expensive enough to form much of a barrier; the hard part is collecting the necessary knowledge. HVAC has always seemed one of the most secretive trades (relatively little good DIY info out there), yet countless articles on this site demonstrate that some HVAC contractors really aren't providing the highest quality analysis to their customers (no offense intended to the many good contractors out there).

Apr 3, 2017 11:35 AM ET

by Malcolm Taylor

These spotlights are excellent. A really good distillation that allows the subject to come into focus.

Apr 3, 2017 11:45 AM ET

by Scott Gibson

Thanks. I'm glad they're useful.

Apr 3, 2017 11:54 AM ET

Potential climate impact and the Chiltrix option
by Charlie Sullivan

Part of the risk of any mini-split installation is the risk of an accidental release of refrigerant if the lines leak. Assuming people reading GBA are often motivated by reducing their climate impact, they should be concerned that a refrigerant release could undo a lot of other good work on minimizing climate impact. (R-410 has a global warming potential near 2000X higher than CO2.) It's possible that a meticulous DIYer could control that risk as well as, or even better than, a random professional, but for most people the best plan is probably to choose a highly qualified professional.

For DIY, I think that a Chiltrix air-to-water heat pump is a better option. Yes, there's a lot to learn to design and install a hydronic system that works well, especially when it's for cooling as well as heating. But the Chiltrix system includes a variable-speed pump and controls inside the unit. And what i think is the key advantage: the refrigerant connections are all factory made inside the unit. The lack of refrigerant lines outside the unit reduces the chances of leaks, and reduces the quantity of refrigerant needed, so there's less impact even if it does at some point leak due to some other failure. Most DIYers would do best to hire a mechanical engineer to design the system if they go with Chiltrix, but I think they could install it themselves.

Apr 3, 2017 1:13 PM ET

Edited Apr 3, 2017 1:14 PM ET.

HVAC installer or heart surgeon?
by David McNeely

In L.A., to replace an 18,000 BTU with a new Mitsubishi (so the 220 v & hole in wall were already present) required calling 27 HVAC contractors to receive four bids. Most wanted to send out a "Comfort Specialist" in 2 or 3 weeks, despite my assertion that I already had experienced what I wanted—I just needed a replacement.

Two bids came in at $3500; one at $5,000; and one at $8,000! Unit cost was less than $1800, and my electrician made the electrical connection. The installer with one helper earned $1700 for the five hours. He probably paid his helper $20/hr, leaving over $300/hr. for himself.

The $8,000 bid would have netted $1240/hr to be split with the help. It would be cheaper to hire a heart surgeon to do the job.

In other countries, mini splits are just a commodity.

Apr 3, 2017 2:43 PM ET

Edited Apr 4, 2017 9:46 AM ET.

Response to David McNeely
by Martin Holladay

I'd like to make a few points:

1. I worked as a roofer and builder for a couple of decades. Work in the trades is honest work, and there is a shortage of skilled workers. All GBA readers should be urging their daughters and sons to enter the construction trades.

2. I never netted anything close to $300 an hour on any job (or even $30 an hour, for that matter). I worked without health insurance, paid vacations, or any type of retirement plan. I wasn't very smart about business.

3. Some electricians, plumbers, and HVAC contractors make a very decent living. Stop whining about it. Get training and open an HVAC business. We need more skilled workers in the field.

-- Martin Holladay

Apr 3, 2017 3:30 PM ET

Edited Apr 3, 2017 3:37 PM ET.

A burdened cost of $20/hr is unlikely (@ David McNeely)
by Dana Dorsett

Unless he is exploiting undocumented immigrant labor there's no way a contractor would have cost structure anywhere near as low as $20/hour for unskilled/semi-skilled labor after paying the various required insurance (including unemployment insurance, workman's comp, etc). The net pay to the employee might be that low, but with the overall picture including the overhead of keeping the lights & phone on at the office is probably starting at $50/hr at the low end, and is more likely to be closer t$100/hr end for a semi-skilled already trained helper, to ~$150/hr for a trained & certified tech. (If the company offers a health insurance package to employees it can be even higher.)

The estimate for the cost of a heart surgeon is also unrealistically low.

$3500 for swapping out a 1.5 tonner where some or most of the ancillary stuff was already pre-installed is realistic, and not a gouge, whereas the $8K bid sounds like someone fishing for enough margin to keep up with the fees at the marina where they keep the yacht.

Apr 3, 2017 5:20 PM ET

Mr Cool Tradeoff
by Eric Barker

To all of the people suggesting that it's impossible or high risk to DIY a minisplit install, how do you think that the "DIY" models are attempting to get around this? Do they simply accept that there's a potential hit to the COP due to the uncertainty of the pre-charged lineset? I also wonder what the real world performance difference is between one of these units and one of the top end Mitsubishi's. You can buy a fair amount of electricity for the ~$3k cost difference between a user installed unit and a professionally installed Mitsubishi, Fujitsu, etc.

Apr 3, 2017 5:28 PM ET

@Dana Labor Rates
by Kye Ford

Here in the great state of NY, home of some of the highest insurance rates in the country, to employ a person in the designated insurance field of "construction" including workers comp, unemployment, liability etc.I pay an about an additional 46% on top of flat wage.

So an entry level laborer at $16/hr would cost about $24/hr, no health insurance.

If your are a small business and your other costs to run your business are pushing your actual costs to employ that laborer to $50/hr, good luck I don't think your are going to be in business too long

Apr 4, 2017 8:15 AM ET

@David. Just an fyi. California is one of the most
by John Clark

expensive states in which to employ people. For example they pay OT per the day (8+ hrs) not per the week (40+ hrs). Very few states do this.

Apr 4, 2017 9:22 AM ET

What, no overhead? (@ Kye Ford)
by Dana Dorsett

What no accounting burdening of the hourly costs with distribution the office or capital expenses in the NY analysis? Counting only the marginal cost is disingenuous. It's not merely the associated insurance etc adding up to 46% for the individual employee. An HVAC business without an office, licenses, tools, or a truck won't be in business for very long either. If you can get all that for $24/hr in a full accounting it's quite a bargain!

In my small 6-person (not construction) business there are a couple people currently working at less than $16/hr, but when the full costs of the business it broken out by the hour it's still ~$50/hr, even after the health care benefits are separated out, and it's not because of a gold-plated office.

It's unlikely that a typical mini-split crew in my area would have unskilled $16/hr labor as the " helper...", but maybe that happens in CA(?).

Apr 4, 2017 2:41 PM ET

Edited Apr 4, 2017 3:50 PM ET.

A better comparison
by Nate G

The point of comparison should be through-the-wall units. I can buy a new 12+ EER window AC for under $200 and install it myself; it plugs right into a standard receptacle. A window unit with heat pump functionality is $400 and a PTHP is $700. Especially in cooling-dominated climates (i.e. at least half the USA and most of the developing world), this is the competition. We're talking commodity vs custom here. To compete with a commodity, custom work has to be substantially better (check), and the price still has to be *reasonable* (nope). 5-20 times the commodity price is not reasonable.

I live in a solidly middle-class neighborhood full of families and retirees. Tellingly, there zero houses with mini-split compressors. However, a number of houses have window AC units or PTACs permanently mounted in wall sleeves. One such house in my neighborhood has a 7 kW solar array on the roof. Evidently the economics favored more PV and less efficient equipment. Once the sleeves are installed, homeowners can replace the equipment themselves forever. Also these devices come in smaller BTU sizes than mini-splits, making them better suited for per-room use anyway, especially for bedrooms. Finally, cheaper mini-splits are now no more expensive than PTHPs (example: pioneer WS009AMFI22HLD), so it's eminently possible that their tech will eventually make it into the commodity machines that are DIY-installable. Through-wall units can also include ventilation, and it's only a matter of time before someone puts a small HRV in one. The game may soon be up for the expensive boutique mini-splits if installers don't figure out a way to cut their prices dramatically. You don't see a lot of refrigerator repairmen anymore...

Apr 4, 2017 4:12 PM ET

The FE12NA is a heat pump, not just an air conditioner (@ NateG)
by Dana Dorsett

The FE12NA quote that prompted this blog piece is a 1-ton cold climate heat pump with specified output down to -13F, and keeps running at temps down to at least -18F (below that it may turn itself off to self-protect due to the temperature sensing thermistor being out of range, according to some of the info sheets.) It has enough output to be the primary heating source for modestly sized better than code houses.

Most people in cooling dominated climates wouldn't be installing one of those, anyway (and certainly not for $4800!) Five years ago on a deep energy retrofit I was involved with quotes for FE18 1.5 ton Hyper Heating cold climate minisplits were in the ~$4500 range, all-in for a new installation, and that's what they were going for in markets the other side of the country too. (I have multiple friends and relatives heating their homes primarily with the FE18). A simple swap-out of a 1.5 tonner shouldn't be more than $3500, but I'd be surprised to find somebody who would do it for much less than $3000, especially in higher priced markets (such as L.A.?).

Sure in temperate or cooling dominated climates the $500-$1000 third-world DIY mini-splits can work, but a wall-plugged unit wouldn't meet code as the primary heat source for the room (or whole house) the way a hard wired technician installed & commissioned mini-split can, and it's unlikely to have the same robustness as the first-tier cold climate mini-splits. They're not really apples-to-apples comparable.

I'm not holding my breath waiting on the model release of PTHPs or PTACs outfitted with HRV core ventilation. The noise levels of PTAC/PTHP still leave something to be desired, but they've gotten better once scroll compressors arrived on the scene. As for sizing, I've never seen a PTAC that can run down to the 1000-2000 BTU/hr range, but there are several 3/4 ton mini-splits (and at least one half-tonner) that can.

Apr 4, 2017 5:34 PM ET

PTAC etc.
by Charlie Sullivan

Really good point, Nate. A lot of the advantages of mini-splits over various alternatives are that all the best variable speed high efficiency compressors and fans are used, rather than that the capabilities of the mini-split are inherently better. The one place the mini-split really inherently wins vs. something that is mounted through the wall is on noise. You can do better in a through-wall unit with variable speed, but there's only so low you can go without separating the compressor--either by using mini-splits, or with air-to-water systems.

Apr 8, 2017 5:20 AM ET

Quieter PTHPs are the future
by Kevin Dickson, MSME

Dana, you said, "wall-plugged unit wouldn't meet code as the primary heat source for the room (or whole house) the way a hard wired technician installed & commissioned mini-split can"

I've been installing whole house PTHPs and have had no trouble with code officials.

Apr 9, 2017 11:37 PM ET

Cost to furnish and install minisplits
by Curt Kinder

While it is appealing to the uknowing to assume $300 - $500 ought to suffice to get a $1500 wholesale minisplit heat pump installed, reality suggests otherwise:

In addition to the usual issues of employee pay, benefits, training, vehicles, insurance, licensure, office and shop space that confront any tradesman, Furnishing and installing aminisplit or any other HVAC system requires:

1) before anything else, someone needs to run a load calc - that means sending a competent person to site (in a vehicle) with a laptop or tablet loaded with licensed software. That guy needs to know how to do a Man J, and it will take some time to make all the necessary measurements and ask the right questions of th cleint.

2) Generally we'll propose 2 - 3 system options from which the client chooses what best fits needs - proposal generation takes time and money.

3) Once the system is selected, a mechanical permit is needed.The city or county will require a permit - that includes a fee, administrative activity to pull the permit, and more to schedule the inspection, requiring coordination with the homeowner.

4) Back office activities include getting the system on order, taking delivery, and then getting it and all its accessories and supplies acquired and staged for pickup by the install team.

5) In addition to the much-aforementioned evacuation, consider also nitrogen purge, brazing or flaring of copper connections, and pressure testing. There is the cost of the copper lineset, and its insulation. Minisplits also need a specialized power and data cable between indoor and outdoor sections.

5a) Complete and proper evacuation should be verified with a micron gauge, competently used.

6) Minisplits, like any other HVAC system, generate condensate which must be reliably collected and drained so as to meet code and not create a nuisance. The condensate drain pipe must be carefully sloped and insulated, possibly even pumped. The indoor unit, if in a sensitive location, may need an additional condensate overflow interlock to prevent damage.

7) The outdoor unit needs to be securely fastened (hurricane code) to a suitably selected, sized, and elevated mounting pad.

8) The client will probably want assurance that the installer has experience and credentials to improve probability of an efficient reliable system - EPA certification is a bare minimum, NATE and / or manufacturer certifications highly desirable.

9) The client will likely need a bit of hand-holding as the system is placed in service - a hands on tour of the control / thermostat, a discussion of maintenance requirements as well as warranty registration of the newly installed system.

10) In addition to the usual during-business-hours back office infrastructure normally taken for granted, most clients value the ability to contact their HVAC contractor after hours, the other 128 hours of the week not covered during 9 - 5, Monday through Friday. Emergency service requires an on-call technician ready to respond as well as availability of loaner portable or window air conditioners and space heaters.

11) After all of the above is furnished and paid for, there is the question of what is a reasonable profit margin for the contractor? A mere 10% profit margin, after all is said and done would please most contractors. Is that too much to ask?

Apr 10, 2017 11:05 AM ET

Response to Curt Kinder
by Martin Holladay

Thanks very much for taking the time to post your helpful comments.

-- Martin Holladay

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