Heat Pump Not Cooling in Summer?

The usual suspects

A stuck reversing valve

The mode-flipping valve jams on the heating side — the giveaway is warm air in COOL with everything else running.

Low refrigerant

The same leak that weakened winter heating shows up as feeble summer cooling.

Dirty coils

A grimy outdoor coil can’t dump heat in summer — capacity plummets on the hottest days.

Thermostat or control faults

A wrong O/B wire setting after a thermostat swap literally reverses the modes. More common than you’d think.

Summer-side faults are our daily bread.

Charge, coils and reversing valves — found with gauges, fixed with your price approved first.

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60 seconds online · or call (206) 486-6373

Worth trying first (5 minutes, free)

1
Confirm COOL mode and setpoint below room temperature.
2
New thermostat recently? Tell us — the O/B configuration is suspect #1.
3
Rinse the outdoor coil gently, power off first.
4
Feel the supply air: warmer than the room in COOL mode = reversing valve territory; book it.

Still not working? Then it’s a technician job — and the sooner it’s booked, the sooner the house is comfortable again. Book the visit →

Stop and book a pro if…

Warm air in COOL mode — don’t keep running it.
Ice on the lines in summer.
The unit short-cycles or trips the breaker.
Hissing at the outdoor unit.

Any of these? Book priority service

Next Phase technician walking a homeowner through the repair

Why homeowners hand it to us

You approve the price first. Upfront quote before a single screw turns.
Same-day service. Book in a minute, hear from a tech within 1 business hour.
500+ jobs done by 4.9★ rated, professional technicians.
Fixed right, guaranteed. If it’s not right, we make it right.

Get It Fixed Today

Quick answers

Why would only one mode break?

Because heating and cooling share parts but not positions — the reversing valve, check valves and metering devices each have a side. A one-mode failure actually narrows the diagnosis nicely.

Is this worth fixing on an older heat pump?

A valve or charge repair on a 8–12-year unit, usually yes. On older equipment with multiple faults we show you the repair-vs-replace math and let you decide — no pressure either way.

How fast can you come in a heat wave?

Cooling-down calls get priority in the hot weeks. Book online — tech contact within 1 business hour, price upfront.

Done guessing?

August is not the month to sweat it out. Book now — tech contact within 1 business hour.