Why Is My AC Running But Not Cooling Properly?
Your AC may run but not cool due to a clogged filter, dirty outdoor coil, low refrigerant, a bad capacitor, or the thermostat set to “fan.” Closed or blocked vents and frozen coils also reduce cooling. Ultimate Heating & Air offers 24/7 diagnostics and repairs in Boise, Nampa, and Caldwell.
Quick checks:
- Set thermostat to Cool and Auto.
- Replace or clean the filter.
- Clear debris around the outdoor unit.
- Open all supply and return vents.
- If coils are iced, turn system off.
Updated: 2026-01-02
Need help in Caldwell, ID? Call (208) 738-4822 or book online.
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- Heating System Repair Diagnostic service: comprehensive diagnosis and report for $49, with 4 Hour Arrival.ultimateheatingandair.com
- $149 A/C Tune-Up with No-Breakdown Guarantee — if your system breaks down within 6 months we'll diagnose at no cost, give priority scheduling, and credit the maintenance charge toward repair.ultimateheatingandair.com
- $149 A/C Tune-Up & No-Breakdown Guarantee + Same Day Service. 100% satisfaction guaranteed. Discounts available for Lion Shield Members.ultimateheatingandair.com
- Air Duct Replacement as low as $107/mo. Includes free proposal, same day service, and financing options available.ultimateheatingandair.com
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