Retrofit HVAC installation in Zone 6a
Our house is a bungalow (1200 sqft) with a 600 sq ft split addition near Toronto, Canada ~ 6A. It is reasonably tight (spray foam throughout).
Our HVAC Retrofit will include replacing an old oil boiler with a NG appliance and installing a ventilation and AC system. When making decisions about this retrofit, IAQ is our most important criteria, followed by operating cost. My wife has a few health issues that make IAQ very important to us.
The two systems I am considering are:
1. Keep existing rads, install a NG boiler for heat and DHW, add an HRV with ducting, and a split AC 2 head unit.
2. Remove rads, install central fan, ducting, furnace and AC with an aircycler g2 to provide balanced ventilation.
In both systems I’m concerned about dehumidification in the summer (we rarely use our AC, but would like to keep RH below 50% for IAQ reasons). I’m think of seeing how the AC works, then adding a portable dehumidifier if needed.
1. Is one option preferable when IAQ is considered?
2. Does my plan for dehumidification seem reasonable for us since we don’t plan on using our AC very often? Or should I look at a whole home system?
3. If IAQ should be similar with both systems – which one would you prefer?
Thanks so much for your help!
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