Is a heat pump worth it in Honolulu?
In Honolulu, a heat pump is the cheaper choice, and not by a little. 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). Lower bills claw that back: about $805 saved annually, for a payback of roughly 1.2 years. Nothing about that conclusion is generic — it's built entirely from Honolulu's own numbers.
Why Honolulu's climate drives this number
Degree days tell the story here: Honolulu racks up 0 heating degree days each year (base 65°F), and summers are severe enough that cooling can dominate the annual bill, with 4070 cooling degree days on the cooling side. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 64.9°F, against a record low of 63.7°F. That puts the seasonal coefficient of performance at 4 for the recommended standard unit. A standard ducted system is enough here; Honolulu's design temperature doesn't justify the cold-climate premium. Climate figures trace to the nearest NOAA station, HONOLULU, 2.2 miles from Honolulu.
The month-to-month numbers for Honolulu
Modelled on a typical 2000-square-foot house, the heat pump draws about 0 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,548 a year. The gas furnace it replaces burns roughly 0 Mcf a year at 52.38 per Mcf here, for a running cost near $2,353 a year (electricity here runs 44.61¢/kWh). Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs about 13.7 years, for a 15-year net position $11,075 ahead.
Electric resistance heat in Honolulu, compared
Not every home in Honolulu has gas service. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. About $805 a year comes back this way, enough that the 6.8-year payback clears the $5,500 premium comfortably within the equipment's life.
Honolulu against the rest of the country
Ranked against the other 3206 cities covered, Honolulu comes in at 3206 for heating severity — 1 would be the coldest place in the dataset — and 56 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 Honolulu
About 344,967 people live in Honolulu, Hawaii, 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.
Ask a local HVAC contractor for a quote before committing either way.
More on how this number was built
Nothing above is a black box: the methodology guide shows the full arithmetic behind Honolulu's 4 seasonal COP and payback figure. See what Honolulu's figure looks like without the $2,000 federal credit in the guide to how that credit moves the payback window.