Heat pump vs. gas furnace in Pasadena, CA
A heat pump earns back its extra cost in Pasadena within a sensible timeframe. 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 $323 of lower running costs every year, landing the payback clock at roughly 3.1 years. That's a real payback, built from Pasadena's own climate and utility rates, not a national guess.
The climate behind Pasadena's payback figure
686 heating degree days pile up here every year, so Pasadena barely has a winter to speak of; the cooling side runs to 2300 cooling degree days, where summers are hot enough that cooling matters as much as heating. 39.2°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 37.4°F on file. Worked through the model, that's a seasonal COP of 3.37 on the standard unit fit for this climate. A standard ducted system is enough here; Pasadena's design temperature doesn't justify the cold-climate premium. Climate figures trace to the nearest NOAA station, EL MONTE AIRPORT, 8 miles from Pasadena.
Pasadena's running-cost comparison, in dollars
Electricity use for heating alone comes out to about 515 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $813 a year. The gas furnace it replaces burns roughly 7 Mcf a year at 22.01 per Mcf here, for a running cost near $1,136 a year (electricity here runs 32.83¢/kWh). Buy it outright, not incrementally, and payback stretches to 34.1 years; over 15 years the net position sits $3,842 ahead.
The other scenario: no gas furnace to begin with
Gas isn't universal in Pasadena — many houses run on electric heat already. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. Switching saves about $736 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 7.5 years.
How Pasadena compares nationally
Ranked against the other 3206 cities covered, Pasadena comes in at 2995 for heating severity — 1 would be the coldest place in the dataset — and 212 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.
Deciding what's next in Pasadena, CA
About 137,195 people live in Pasadena, 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, it's worth getting quotes before your current system fails, not after.
Line up a few local HVAC quotes before you decide.
More on how this number was built
The methodology guide walks through exactly how Pasadena's 3.37 seasonal COP and the rest of this page's numbers get built. See what Pasadena's figure looks like without the $2,000 federal credit in the guide to how that credit moves the payback window.