Did your furnace or AC quit out of nowhere?
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Start by deciding which of four jobs you actually have: maintenance (tune-ups, filter and coil cleaning), repair (a specific failed component), replacement (swapping an existing furnace, air conditioner, or heat pump for a similar one), or new installation (adding equipment where none existed, or changing fuel types or system design). Contractors price these differently, and a request that clearly states the scope gets more accurate quotes.

Write down the age of your current equipment, the fuel it uses, any rooms that stay too hot or too cold, and whether the thermostat, ductwork, and electrical panel are staying. Photos of the equipment nameplate and the area around the indoor and outdoor units help a contractor give a realistic range before visiting.

A common rule of thumb is to compare the repair cost against the age of the system: if the repair is expensive and the equipment is near or past its typical service life, replacement usually wins on total cost. Air conditioners and heat pumps commonly last roughly 10 to 15 years and furnaces 15 to 20, though maintenance history matters more than the calendar.

Refrigerant is a deciding factor for older air conditioners. Systems using R-22 can no longer be economically recharged because production of that refrigerant ended, so a major refrigerant-side repair on an R-22 system usually means replacement. Ask any contractor quoting a big repair to state, in writing, the expected remaining life of the equipment if the repair is done.

Equipment efficiency rating, capacity, and brand tier are the visible price drivers, but the hidden ones matter more: ductwork condition and sizing, the electrical circuit available, refrigerant line-set routing, condensate drainage, permits, and whether the installation requires a crane, attic work, or code upgrades such as a new disconnect or condensate safety switch.

Load calculation is the line item that separates careful contractors from guessers. A proper Manual J style load calculation sizes the equipment to your home's insulation, windows, and orientation instead of copying the old unit's size. Ask each bidder whether they performed one; an oversized system is a common and expensive mistake.

Get at least two or three written, itemized quotes. Each should list the equipment model numbers, efficiency ratings, warranty terms for parts and labor, what happens to the old equipment, permit responsibility, and the payment schedule. A single lump-sum number with no model numbers cannot be compared to anything.

Compare warranties line by line. Manufacturer parts warranties commonly run 10 years on registered residential equipment, but labor warranties are set by the contractor and vary widely. The cheapest bid with a one-year labor warranty can cost more over time than a mid-priced bid with strong labor coverage.

Licensing for HVAC work is set by your state, and sometimes your city or county, so verify the contractor's license or registration with the agency that issues it where you live — our state guides link each state's lookup tool. Any technician who handles refrigerant must hold an EPA Section 608 certification; that is a federal requirement, not optional.

Replacements and new installations typically require a mechanical permit and inspection. Ask who pulls the permit — it should be the contractor — and be cautious of anyone who suggests skipping it, because the inspection is your independent verification that the installation meets code.

Ask: Will you perform a load calculation and show me the result? What is the model number and efficiency rating of the proposed equipment? What is covered by the labor warranty and for how long? Who pulls the permit and schedules the inspection? What is the payment schedule, and is any deposit refundable? Get the answers in the written quote, not over the phone.