Top 7 HVAC companies in Honolulu, Hawaii

Honolulu sits in IECC zone 1A with zero heating degree days and 4,300 cooling degree days. Equipment must handle constant humidity and salt-air corrosion while delivering dehumidification year-round. The seven firms below are ordered by Bayesian-adjusted rating that pulls every raw score toward the national mean of 4.764. Review volume, listing category, website presence and published availability supply the tie-breakers.

How to choose

Companies receive a Bayesian-adjusted rating that moves their raw star score toward the national mean of 4.764 until review counts grow large enough to stand alone. A 5.0 from four customers therefore cannot outrank a 4.9 from two hundred. Additional signals are a public website, HVAC-specific listing category rather than general contracting, and published 24/7 availability. This shortlist is built only from public listing data and the published formula; it is not a review of work performed.

The shortlist

AIRPRO Indoor Air Solutions

AIRPRO Indoor Air Solutions operates from 1916 Democrat St, Honolulu, HI 96819 and lists (808) 832-1178. Its Services category and 24/7 availability point to dedicated HVAC focus with round-the-clock response. Six reviews produced a raw 5.0 that the adjustment lowered to 4.863, still above the national mean of 4.764 because the modest review count limits how far the score can move. The public website and 24/7 signal supplied the final ranking edge. These numbers cannot reveal how the firm handles salt-air coil protection on actual jobs.

AirReps Hawaii

AirReps Hawaii lists three reviews at a raw 5.0, adjusted downward to 4.825 at 1734 Kanakanui St, Honolulu, HI 96819, phone (808) 846-9270. The General contractor category and lack of 24/7 availability place it behind the first firm despite the identical raw score. Its public website supplied the only tie-breaker. The small review count kept the adjusted score close to the national mean of 4.764. Nothing in the listing shows experience with the corrosion protection required in Honolulu's marine environment.

RMI Mechanical

RMI Mechanical also carries three reviews at raw 5.0, adjusted to 4.825, from 2412 Rose St #103, Honolulu, HI 96819, phone (808) 422-5454. Its General contractor listing and absence of 24/7 availability match the second firm exactly, so the ranking rests on identical signals. The public website is the sole additional factor. Limited reviews prevent the score from diverging far from 4.764. The data give no indication of mini-split or dehumidification expertise.

Air Conditioning Solutions Supply

Air Conditioning Solutions Supply shows one review at raw 5.0, adjusted to 4.812, at 1711 Akahi St, Honolulu, HI 96819, phone (808) 848-2051. Manufacturer category and no 24/7 availability limit its position. The public website provided the only ranking signal. A single review keeps the adjusted score nearest the national mean. The listing supplies no evidence of field installation experience.

KW Air Conditioning LLC

KW Air Conditioning LLC also has one review at raw 5.0, adjusted to 4.812, from 1430 Kealia Dr, Honolulu, HI 96817, phone (808) 347-3136. General contractor category and lack of 24/7 availability place it below the manufacturer entry. Its public website is the sole tie-breaker. The tiny review count holds the score closest to 4.764. No data address corrosion-resistant equipment selection.

Preferred Mechanical LLC

Preferred Mechanical LLC records three reviews at raw 4.3, adjusted upward to 4.742 because the score sits below the national mean, at 2026 Colburn St, Honolulu, HI 96819, phone (808) 595-4321. General contractor category and published 24/7 availability supplied the ranking signal. No website is listed. The modest review count allowed only a small upward movement. The numbers cannot show whether 24/7 coverage translates to faster response on corrosion-related failures.

Johnstone Supply

Johnstone Supply holds seven reviews at raw 4.1, adjusted upward to 4.678 at 1320 Kalani St, Honolulu, HI 96817, phone (808) 842-6000. The empty listing category and lack of 24/7 availability place it last. Its public website is the only positive signal. Seven reviews still leave the score below the national mean. The data cannot indicate whether the firm performs installations or only supplies parts.

Cost

Typical full-system install cost is listed at $15,650 with a published range of $14,100-$17,200. Invoiced 2025 averages reached $18,041, with the upper quartile at $30,410. Labor is stated at $200 per hour and permit fees run $250-$650. The two cost sources show closest agreement among all tracked markets, yet the upper-quartile figure indicates wide job-to-job variation. Highest national cost tier reflects both labor rates and logistics to an island market. Homeowners should expect the permit fee to be paid separately to the City and County of Honolulu.

Licensing and permits

Hawaii contractor licensing is administered at the state level by the Hawaii Department of Commerce and Consumer Affairs (DCCA) — Professional & Vocational Licensing Division, Contractors License Board. The required license class is C-52 Ventilating and Air Conditioning Contractor. The state mandates liability insurance of $100,000/$300,000 and $50,000 property damage plus continuous workers' compensation insurance. Permit and inspection requirements for a residential HVAC changeout are set by the local county building department, for example the City and County of Honolulu's Department of Planning and Permitting. License lookup is available at the public search portal. No state-level insurance waiver exists.

Incentives

Hawaii Home Energy Rebates (HSEO) are approved for launch in spring 2026 with a planned $8,000 maximum heat-pump rebate. The Renewable Energy Technologies Income Tax Credit offers 35 percent for solar or wind, and a solar water heat mandate applies to new homes. Hawaii Energy ratepayer programs provide $300-$1,500 utility rebates but require participation in the contractor network. Federal 25C and 25D credits expired at the end of 2025; no residential federal HVAC tax credit remains for 2026. Highest electricity rates in the nation strengthen efficiency economics, yet the market is cooling and dehumidification only. Salt-air corrosion protection on coils becomes a required specification.

Climate

Honolulu records zero heating degree days and 4,300 cooling degree days in zone 1A with a moist regime. Winter design temperature is 63 °F and summer design is 89 °F under constant high humidity moderated by trade winds. The load profile is cooling-dominant with electricity as the primary heating fuel, so cooling-only equipment is standard. Ductless mini-splits dominate installations. Salt-air corrosion shortens equipment life, demanding coated coils and stainless fasteners. No heating load exists, therefore heat-pump sizing focuses entirely on sensible and latent cooling capacity.

Public listing data alone cannot confirm workmanship or long-term reliability. Verify every C-52 license and insurance certificate directly with the DCCA before signing a contract.