I am building a new home and the HVAC provider/contractor has proposed a single, shared system to heat/cool both my main living and garage areas. Proposed solution has separate returns, thermostats and duct/damper controllers for each area, although nothing would prevent both areas being engaged at same time. Is this allowed, code-wise?
Home is in Texas, USA.
Certainly IRC includes section M1601.6 titled "Independent Garage HVAC Systems" which states that
Furnaces and air-handling systems that supply air to living spaces shall not supply air to or return air from a garage.
https://codes.iccsafe.org/content/IRC2018/chapter-16-duct-systems
According to https://up.codes/viewer/texas/irc-2015/chapter/16/duct-systems#16
That IS applicable/adopted without amendment (and the 2015 .vs. 2018 code language is unchanged) in Texas, so I'd find another HVAC contractor, pronto, personally. If they don't know the code in the state they operate in, what else are they screwing up?
