I’m a builder planning my first conditioned attic and have questions and concerns.
1. We build slab on grade. Any problems placing sealed combustion furnaces (Carrier) and water heaters (Navien) in the conditioned space? My concern is that I assume they are at least somewhat leaky (CO, CO2, etc.). If so, does that pose a problem to IAQ?
2. I’m planning on using a balanced mechanical ventilation system (another first for me). I have read much on this website and others about ERV’s, HRV’s and other options, but am still having difficulty in choosing one. Bringing fresh air directly into the central air returns via a controlled damper sounds appealing and more economical. I build only spec homes so cost is definitely a deciding factor for me. The home will be in Oklahoma City which is kind of in the middle of hot & humid and cold. We get both extremes, but not for long periods of time.
Any suggestions are appreciated