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Most repairs run about $150 to $600 — a capacitor or ignitor is on the low end, a compressor or heat exchanger much higher. A new system usually costs several thousand dollars. Ask for the price after the diagnosis.

In most states, yes, and anyone handling refrigerant needs EPA 608 certification. Ask for the license number before work starts.

Air conditioning, furnaces, heat pumps and boilers; duct cleaning, ductwork and air quality; new systems, thermostats and maintenance plans. Pick a service above to find contractors that offer it.

Once a year for each part — the AC before summer and the furnace before winter — plus a filter change every one to three months.

If the system is over 12 to 15 years old, needs a costly repair, or uses old R-22 refrigerant, replacing it is often the better deal. A good contractor will show you both prices.