HRV system and mini-split systems
Hi GBA – my main question has to do with new construction and what type of HRV system does one put in a 2000 sf barn ranch single floor home if they are using mini-splits? but I also have other questions imbedded in my post . In my case we have 12 foot ceilings with floor and attic trusses. The attic will have closed cell foam under roof deck so attic will be open. It’s 84 feet long x 26 wide so attic looks like a bowling alley down the middle that has an Advantech sub-floor. 1 st floor has a 1 inch thick Advantech sub-floor.
I am torn on what HVAC system to install. Plumber said best bang for the buck is forced hot air with boiler, ducts in walk-out basement that is not insulated. Insulation will be in the floor trusses. When I mentioned air-handlers the plumber frowned as I am thinking who installs a boiler with a single fan with ducts to everywhere anymore? Plumber said with 12 foot ceilings we are going to want the ducts in the floor and I am not so sure that is true as he claims you will not get warm with heating from above. I would think with today’s tight homes this is not true.
I also hate forced hot air.
I was thinking Mitsubishi Mini splits that would provide air and heat, but I am wondering about maintenance of say 5 or 6 ceiling cassette units. I think a couple times a year you have to clean each one. I know Mitsubishi makes two other types of ducted units – one is an actual air handler and the other is other is smaller. I’ve seen Matt Ressinger use the smaller units to do a master bedroom, closet and bathroom, so I would need about 4 of these with each one ducted. I think pluses also are 1) it’s easier to just change the air-handler filters rather than open and cleaning each ceiling cassette unit 2) Installing two outdoor mini-split outside units on each end of the 84 long house would simply be two air conditioning condensors if I had to go with forced hot air with two air handlers.
I am getting away from my question which is what type of HRV system does one put in a home or if they are using mini-splits?
Does one have to add duct work in addition to the mini-split ductwork if I use the ducted version? This new build has MB on one end, two bedrooms on the other end, and a open concept in the middle of kitchen and living room as one.
I figure if I needed more heat, I could add radiators to give the radiant feel and use the Mitsubishi units for air and backup heat. We also will have a wood burning stove in the center area for real cold days – I’m in a Zone 5.
They make a Mitshubishi unit that goes down to -4 and one that goes down to -14. Can I ask what units others in Zone 5 what Mitshubishi mini-splits they used and how did they perform with a -4 vs a -14 models.
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