Balance Point
The outdoor temperature at which a heat pump's output exactly matches your home's heat loss. Below the balance point, supplemental heat (electric strips or a furnace in dual-fuel setups) makes up the difference. Modern cold-climate heat pumps push the balance point low enough that supplemental heat rarely runs in Western Washington.
The longer answer
Balance point is specific to your home and your equipment — a leaky 1920s Craftsman has a higher balance point than a tight new build with the same heat pump. Insulation upgrades lower the balance point; oversized equipment doesn't change it but can cause short-cycling above it.
In dual-fuel systems, the thermostat switches from heat pump to furnace at a set outdoor temperature — typically around 25–40°F depending on equipment. In Seattle, cold-climate ductless units often never reach their balance point in a normal winter, which is why backup heat stays off and operating costs stay low.
The Seattle angle
Seattle's mild winter lows are comfortably inside a modern heat pump's efficient range — the main reason heat pumps pencil out so well here.
Guides that use this term
Where this decision happens
Nearby in the glossary
Ready for comfort you can count on?
Whether it's a furnace that quit on a cold morning or a whole new system, the Glendale team is ready. Honest pricing, expert work, and 87+ years behind every visit.
Hours & Emergency
- Mon–Sat: 8:00 AM – 7:00 PM
- Sun: Emergency On-Call Only
- Emergency line: (206) 243-7700