Hot upstairs? AC struggling? Start here.

HomeAdvisor’s 2026 guide reports a $417 national average for AC repair, with a typical range of $172–$664 across different AC systems. These figures are general budgeting references, not a quote, advertised rate, or price cap from Great Falls Heating and Air. Your repair may cost less or substantially more depending on the fault, parts, refrigerant, equipment access, labor, warranty coverage, and any emergency or after-hours charges. Call to confirm the diagnostic fee and what it includes, then review the proposed repair price before approving work.

Sources: HomeAdvisor: national AC repair costs (June 2026)

Thermostat settings, a restricted filter or airflow path, outdoor-unit trouble, icing, or a refrigerant problem can cause similar symptoms. Check the homeowner controls and accessible filter only as your equipment instructions allow. Tell us whether every room is warm or just one area, when the problem started, and whether you see ice or an alert. Those details help guide testing; they don’t identify a failed part by themselves. Keep electrical covers closed. For smoke, sparking, or a burning smell, stop troubleshooting and stay clear; leave and call 911 for fire or immediate danger.

Sources: Carrier: reasons an AC runs without cooling

No. Switch cooling off and call for guidance. Use fan-only mode only if the blower is operating normally and your equipment instructions allow it. Don’t chip ice, apply heat, remove panels, or keep restarting cooling. Thawing doesn’t fix the underlying cause, and there isn’t one thawing time that fits every system. Airflow restrictions, refrigerant trouble, or another fault may need testing. Stay clear of water near electrical equipment and report it when you call.

Sources: Carrier: frozen AC coils and underlying causes

The system may be cooling while air isn’t reaching the rooms that need it. Sun exposure, insulation, duct leaks, return-air paths, thermostat location, and airflow can all matter. Tell us which rooms overheat, when it happens, and whether doors are usually closed. Keep grilles clear, but don’t close a group of downstairs vents or change blower settings to force air upstairs. Have the airflow and room conditions assessed before assuming a bigger AC or a new part will fix the problem.

Sources: Trane: hot upstairs rooms and uneven temperatures

Cooling can help you keep windows closed during a smoke event, but fine-smoke removal needs suitable filtration. For central systems, EPA recommends MERV 13 or the highest efficiency the system can accommodate. Check compatibility, fit, and filter condition; a higher rating alone doesn’t mean a filter suits your blower. Inspect more often during heavy smoke. A properly sized portable air cleaner can help. Standard ductless washable screens aren’t a substitute for fine-particle filtration. Follow current local guidance, and seek a cooler location if you can’t keep the home comfortably cool.

Sources: EPA: cooling, compatible filters, and indoor air during wildfire smoke

Only do the cleaning your exact model’s owner instructions permit. Turn the system off and follow its power-isolation instructions first; turning down the thermostat doesn’t isolate electrical power. Keep loose debris away and use only the coil’s approved gentle cleaning method. Don’t remove the fan or panels, spray electrical components, use a pressure washer, or force a brush into the fins. Matted fluff, difficult access, or an unfamiliar unit are reasons to arrange professional cleaning. A clean-looking cabinet alone doesn’t tell you the coil is clear.

Sources: Carrier: coil-specific cleaning methods and precautions

Start with the diagnosis, equipment condition, repair history, parts availability, warranty, and written repair price. A repair may make sense for an otherwise sound system. Repeated failures or a major repair can make replacement worth comparing. Age alone doesn’t settle it. If the main problem is one hot room, assess airflow and the house too. When replacement makes sense, compare the full installation work for standard AC and a heat pump, including existing-furnace compatibility and expected heating use. Confirm any rebate separately before counting it toward the price.

Sources: ENERGY STAR: replacement and whole-system considerations; DOE: heat pumps for heating and cooling

No. EPA says existing systems can continue to be used and repaired as refrigerants are phased down. That doesn’t guarantee every part or refrigerant will always be available at the same price. Have the actual refrigerant and compatible repair options identified before deciding. A different refrigerant isn’t automatically suitable for your equipment, and recharging isn’t routine upkeep for a leaking system. Ask what caused any refrigerant loss, what repair is proposed, and how operation will be checked afterward.

Sources: EPA: continued use and repair of existing air conditioners