House is a three-layer cake, 31x31 footprint, ICF walkout basement, two framed levels above. Built in a locale with about 10,000 heating degree days.
HVAC is open-loop well-sourced geothermal, unit is by WaterFurnace. Insulation in framed walls is medium density closed cell foam sprayed in place, cold roof is over the top floor ceiling which is sealed with poly and has about 20 inches of blown loose cellulose atop. Call it about an R-65.
Electricity costs on average, about 4.4 cents per KWH.
Windows are all triple-pane, high performance with warmedge spacers, special inert gas fill, coatings, etc. Frames and sash are foamfilled pultruded fiberglass.
A bath on each floor is vented via a ceiling inlet, all ducted to an HRV (Fantech) in the mechanical room. What is the value of this HRV?
It’s supposed to recover heat that would otherwise be lost to the outside through the bath vent exhaust. If your asking what percentage of heat is recovered and returned, I think you would need to check the [Fantech] manufactures specs.
It sounds like you have a super insulated tight house - while you can never build a house to tight, you can under ventilate it. The HRV is to pull fresh air in, while removing all the bad air from inside while recouping up to 80% of the heat / energy spent to condition it
Your house sounds fairly tight.
So you may not have enough air infiltration for regular bath exhaust fans to be able to vent your bathrooms.
So the HRV is removing the moisture and odors from your bathroom and replacing it with fresh air.
Which does few things.
Brings in fresh air to keep CO2 and other pollutants diluted to a safe and healthy level.
Exchanges some of the heat in the stale air with the fresh air it brings in. Saving you money on heating and cooling.
Helps keep the humidity down in the winter(tight homes can have too high of a humidity in the winter).
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