A heat pump is an air conditioner that can run in reverse. Flip the mode toggle and watch the refrigerant flow change direction.
A heat pump is a refrigeration loop that can run in both directions. In summer it works exactly like a central AC, moving indoor heat outside. In winter, a reversing valve flips the flow: the outdoor coil extracts heat from cold outside air (there's usable heat in air well below freezing) and delivers it indoors. One system, both seasons, no fuel burned.
Tap any numbered part to learn what it does and how it fails — or press play to watch a full cycle.
Yes. Modern cold-climate heat pumps hold their rated capacity to around 5°F and keep producing useful heat well below zero. What changes is efficiency: as the temperature gap grows, the compressor works harder, and below each system's balance point the auxiliary strips share the load. If yours can't keep up at 30°F, that's a service issue, not a heat-pump limitation.
Light frost and periodic steam clouds are normal — that's the defrost cycle reversing briefly into cooling mode to melt frost off the outdoor coil. A coil encased in solid ice for hours is not normal: it points to a failed defrost sensor, low charge, or a fan problem, and it will grind capacity down until it's fixed.
It depends on your climate, electric rates, and existing equipment. Heat pumps shine in mild-to-moderate winters and all-electric homes, and they replace two systems (AC + heater) with one. In severe-winter regions, a dual-fuel setup — heat pump for most days, gas furnace for cold snaps — is often the best of both.
The breakdowns we see most, the symptoms that give them away, and the smart first move for each.
The symptom: Cold air in heating mode (or hot air in cooling), or capacity that drops in both modes.
Smart move: A technician can free or replace the valve solenoid. Don't run it stuck — you're paying full price for the wrong output.
The symptom: Outdoor unit encased in ice; heating fades; loud fan buzzing against frost.
Smart move: Shut the system to "emergency heat" and book service. Running iced-over strains the compressor and fan blades.
The symptom: The "aux heat" indicator stays on and electric bills jump 2–3x.
Smart move: Your heat pump has likely lost capacity (charge, coil, or compressor). Service recovers the efficiency you bought the system for.
The symptom: Weak heating and weak cooling in the same year — the tell that both modes share one loop.
Smart move: Leak-search and repair. A yearly "top-off" habit costs more than fixing the leak.
Every part in the diagram above is exactly what a My Happy Home membership exists for: when it breaks, a vetted expert fixes it — for one low monthly payment, with no hidden fees.
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Your air conditioner doesn't make cold air — it moves heat out of your house. Watch the refrigeration cycle in motion, part by part.
ExploreFrom the thermostat's call to warm air at the vents — follow the burn, the heat exchanger, and the one crack that makes a furnace dangerous.
ExploreFollow the power: through the meter, past the main breaker, into branch circuits — and the safety layers standing between electricity and everything you love.
ExploreMembership covers the repairs on every system you just explored — one low monthly payment, vetted experts, no hidden fees.
