Choosing the right heating contractor may be harder than choosing the right heating system. Ask friends and neighbors for recommendations, or look on the web for HVAC technicians or contractors—on Angie’s List, for example, or Service Magic.
A competent HVAC contractor will be certified by ACCA (Air Conditioning Contractors of America) and will determine your heating load and equipment needs using ACCA Manuals J and S, taking into account
So the contractor should ask you a lot of questions:
Your HVAC contractor needs to measure all your windows, determine their orientation to the sun, and check their insulating value and SHGC before calculating the size of the new heating system.
All this information will indicate how much heat the system must generate on the coldest days in your climate and over the annual heating season in order to keep you comfortable. These numbers are usually expressed in Btu (British thermal units) per hour and per heating season. For electric systems, they can be expressed in kW per hour and in kWh per heating season.
Your HVAC contractor must also understand how fresh air will be circulated throughout your home. Your heating system affects the IAQ and moisture level in your home. If you have been having problems with either, now is the best time to correct them, and especially to ensure that a new system won’t make them worse.