What’s so wrong about oversizing HVAC?
We’re building a new home.
Yes, I’ve heard the advocates of right-sizing the A/C to keep the unit as small as possible. Take into account everything — windows, ceiling ht, wall types (in our case, SIP with 6″ foam, etc. Size system for max summer temps (in our case, 105 degrees a dozen or so days). etc. That way humidity is better controlled with a system that is constantly going during those maximum days.
An oversized system, on the other hand, costs more to buy and operate and won’t control humidity as well since it’s off much of the time, one needs a dehumidifier — for one thing.
Have I missed anything? Of course I must have because so many systems are installed by Joe Bubba who convinces the homeowner that if the computer misses something in its calculation then their house will not be cool enough during those hot days — therefore simply add a ton for good measure.
Okay, what’s so wrong with that. Is the cost of a dehumidifier and its running cost all that great? Is that the only downside? Has anyone put a pencil to both sides of this issue?
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