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Ask for a certified HVAC technician, (certification not required in all states).
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Your contractor should be licensed, well trained, and an experienced installer, ask if he is insured and bonded.
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Good contractors own and use refrigerant recovery equipment and are certified to handle refrigerant in cooling systems. Ask for proof of certification, (if applicable to your state).
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A good contractor will estimate the cooling loads and duct requirements by collecting detailed information in your home and using calculations to determine the correct size for your home.
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He or she should measure ceilings, floors, windows, walls and check insulation throughout the home. Systems that have been sized properly to fit your home provide better humidity control, cycle on and off less frequently, and cost less than oversized systems. Insist on getting a copy of the load calculations (or computer printout). These can be useful for comparing bids.
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Don't use a contractor who wants to size your unit solely on the square footage of your house.
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Ask your contractor to inspect your ducts for leaks, incomplete connections and compatibility with the rest of your system. Ideally, your contractor should use diagnostic equipment and repair leaks using a quality duct sealant (duct tape is not sufficient).
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He or she may also recommend changes to your duct system; as much as 30% of the efficiency of your system is related to the quality of your ductwork. Overlooking duct improvements may compromise comfort and cost you money.
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If your house or water heater uses combustion (i.e., burns something like natural gas or fuel oil), you should have a house pressurization test performed to make certain there is no danger of "backdraft." Backdraft occurs when fumes created by combustion process are pulled back into the home.
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Your air conditioner or heat pump condenser should always match the indoor coil. Your contractor should replace both coils at the same time for maximum efficiency.
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Have your contractor select an installation location that provides ease of maintenance (make sure the inside coil can be reached for cleaning). Depending on the model, the contractor may need to install an access panel.
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The coil should be cleaned every two years, and the air filter should be easy to remove, and be cleaned or changed whenever it is dirty (this can be done monthly during peak season).
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If possible, have the contractor place outdoor units on the north or east side of the house (out of direct sunlight). Keep the area free of debris and shrubbery; leaving plenty of room for free air flow on all sides, and four feet at the top.
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Always obtain a written contract or proposal before allowing your contractor to install a new heating and cooling system, and be sure to ask about warranties and maintenance agreements, (length, parts and labor coverage). Carefully evaluate a contractor's proposal to ensure you get the equipment and service that best meets your needs.
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Remember, the contractor who gives you the lowest bid may not be the best choice for you. Paying slightly more may get you better equipment and better service.
