Will a heat pump pay off in Tustin, CA?

Tustin sits right on the fence — how long you'll own the house decides this one. Against a like-for-like gas furnace and AC swap, going electric costs $1,000 more up front here (already netting out a $2,000 tax credit). That premium is recovered through $106 of lower running costs every year, landing the payback clock at roughly 9.4 years. Whether that's worth it in Tustin depends on how many years you expect to own the place.

Why Tustin's climate drives this number

Tustin barely has a winter to speak of — 1159 heating degree days a year against a 65°F base — and summers add a moderate cooling load, at 804 cooling degree days. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 43°F, against a record low of 41°F. That puts the seasonal coefficient of performance at 3.48 for the recommended standard unit. A standard ducted system is enough here; Tustin's design temperature doesn't justify the cold-climate premium. Climate figures trace to the nearest NOAA station, J. WAYNE APT-ORANGE CO APT, 4.7 miles from Tustin.

The month-to-month numbers for Tustin

Modelled on a typical 2000-square-foot house, the heat pump draws about 843 kWh a year to keep it warm, plus cooling, for a combined electric bill near $502 a year. The gas furnace it replaces burns roughly 12 Mcf a year at 22.01 per Mcf here, for a running cost near $608 a year (electricity here runs 32.83¢/kWh). Looked at as a full purchase rather than an incremental one, payback here is roughly 103.9 years, leaving the 15-year total $588 ahead.

The other scenario: no gas furnace to begin with

Plenty of homes in Tustin heat with electricity alone, no gas line involved. Swap the comparison to resistance heat instead of gas, and Tustin's answer improves. Switching saves about $804 a year here — a heat pump moving heat rather than generating it needs far less electricity than resistance coils — so the extra $5,500 spent up front comes back in about 6.8 years.

Tustin against the rest of the country

Ranked against the other 3206 cities covered, Tustin comes in at 2820 for heating severity — 1 would be the coldest place in the dataset — and 473 by population, where 1 is largest. That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.

What to do with this number in Tustin

About 78,863 people live in Tustin, California, and every number on this page is what a contractor would actually work from when quoting a system here — the point isn't to replace that quote, it's to tell you whether to bother asking for one. Here, there's no cost penalty to waiting until your current furnace or AC actually needs replacing.

Line up a few local HVAC quotes before you decide.

More on how this number was built

The methodology guide walks through exactly how Tustin's 3.48 seasonal COP and the rest of this page's numbers get built. Not every home in Tustin has gas; the guide comparing a heat pump against electric baseboard covers that case separately.