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Begin by choosing a licensed/NATE* contractor. If you don’t know one, ask a friend for a referral or check with your local Better Business Bureau or the local chapter of the Air Conditioning Contractors of America (ACCA).
** When you meet with them, be sure to use these guidelines:
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A precise load calculation will ensure that your system is properly sized so it delivers the comfort and efficiency you expect. Doing a precise load calculation may also save you money by avoiding the purchase of a system that’s too large for your house.
Insist on a room-by-room load calculation using the ACCA Manual J to determine the exact amount of heating and cooling required for each room. Do not accept “rules of thumb.” This calculation should be done on a computer and take into account: air-leakage rates, insulation in the walls and ceilings, the size and location of the doors and windows, the location of the house in relation to the sun, and external factors such as trees, or overhanging porches.
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Ask your contractor if he sells multi-stage systems equipped with a Genteq ECM variable-speed blower motor. If your system is less than 10 years old, ask your contractor about upgrading your motor to a Genteq ECM blower motor rather than replacing your whole system.
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Ask your contractor to follow the ACCA Manual D guidelines when designing and installing your ductwork.
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Ask for references of others who have purchased these systems.Insist on a written cost estimate and written work contract. Inquire about product warranty and service contracts.
* North American Technician Excellence
** Use the contractor locator at ACCA’s Web site: www.acca.org and www.natex.org