Top 7 HVAC companies in Alameda, California

Public listing data for Alameda County yields a shortlist of seven HVAC entries ranked by Bayesian-adjusted star rating. The method pulls each raw rating toward the national mean of 4.764 until review volume is large enough for the score to stand alone. Most entries here have zero or one review, so the adjusted scores cluster near the mean and small tie-breakers such as a public website or published 24/7 availability decide final order. This is a shortlist built from public listing data, not a review of work performed.

The shortlist

Air Treatment Corporation

Air Treatment Corporation operates from 1320 Harbor Bay Pkwy Ste 150, Alameda, CA 94502. Its single review carries a raw rating of 5.0 that the Bayesian adjustment lowers to 4.812 because the national mean sits at 4.764 and one review supplies little weight. The listing category of general contractor and the presence of a public website supplied the remaining ranking edge. These numbers cannot reveal whether the firm maintains C-20 licensing or carries the required contractor bond.

Trane - Heating & Cooling Services

Trane - Heating & Cooling Services lists its address as 383 4th St #202, Oakland, CA 94607 and can be reached at (844) 710-3102. With zero reviews the raw rating of 0 receives an upward Bayesian adjustment to 4.804, still below the 4.764 mean because the model applies only modest pull on empty data. The public website constitutes the sole ranking signal. The figures give no information on actual response times or completed work.

FrostWave HVAC Expert

FrostWave HVAC Expert is located at 18 Littlewood Dr, Piedmont, CA 94611 and lists the phone number (479) 522-2516. Zero reviews produce a raw rating of 0 that adjusts upward to 4.784. Published 24/7 availability supplies the tie-breaker that places the firm third. The service-category listing suggests narrower HVAC focus than a general-contractor entry, yet the numbers cannot confirm whether the firm holds the C-20 classification.

Allied mechanical cooling corp./

Allied mechanical cooling corp./ operates from the parking lot on Wood St, Oakland, CA 94607 and answers calls at (559) 853-4998. One five-star review yields a raw rating of 5.0 that adjusts downward only to 4.772, the smallest movement among the five-star entries because the review count remains low. No additional ranking signals appear. The data cannot indicate whether the firm carries workers-compensation insurance.

Oakland AC Repair Heating & Cooling

Oakland AC Repair Heating & Cooling lists its address as 3000 Lakeshore Ave #236B, Oakland, CA 94610. Zero reviews leave the raw rating at 0, which adjusts to 4.764 exactly at the national mean. The general-contractor category and absence of a website or 24/7 flag produce no further movement. These figures supply no evidence of completed installations or permit history.

Supreme climate control

Supreme climate control is located at 2900 Glascock St, Oakland, CA 94601 and can be reached at (800) 939-1803. Zero reviews again produce an adjusted score of 4.764. The general-contractor listing supplies no additional signals. The numbers cannot disclose whether the firm participates in the TECH Clean California contractor network required for state rebates.

United mechanical inc.

United mechanical inc. operates from 815 Atlantic Ave, Alameda, CA 94501. Zero reviews result in the same adjusted score of 4.764. The general-contractor category and lack of website or 24/7 listing leave the firm last. The data give no indication of Title 24 compliance experience.

How to choose

Verify every firm through the CSLB license lookup before requesting quotes. Confirm participation in the TECH Clean California network if state rebates are part of the budget. Ask which HERS rater will perform the mandatory duct-leakage and refrigerant-charge tests and who pays for any re-test after a failed inspection.

Cost

Installed-cost figures diverge sharply. One source lists a typical full-system price of $12,550 inside a range of $11,200-$13,900, while invoiced 2025 data show an average of $23,465 and an upper quartile of $33,723. Labor is stated at $165 per hour and permit fees range from $250-$700. The gap between the two cost sources is itself useful information when setting a project budget.

Climate

Alameda County spans IECC zones dominated by 3B and 3C with both dry and marine moisture regimes. Heating degree days total 2,200 and cooling degree days total 1,000, producing a balanced mixed load. Winter design temperature is 44 °F and summer design temperature is 89 °F. Coastal portions often need no cooling equipment while inland pockets are cooling-dominant; Title 24 compliance and proper sizing therefore matter more than raw capacity.

Licensing and permits

The Contractors State License Board issues the C-20 Warm-Air Heating, Ventilating and Air-Conditioning license at the state level. A $25,000 contractor bond is required by statute and workers-compensation insurance is mandatory whenever employees are present. Building permits for residential HVAC changeouts are issued by the local city or county building department, not by the CSLB. Homeowners must confirm the specific jurisdiction rules inside Alameda County.

Incentives

California Home Energy Rebates and HEEHRA remain available in Phase 1, offering up to $8,000 for qualifying heat pumps. Utility programs through PG&E and others add $1,000-$3,000. No statewide residential HVAC tax credit exists for 2026 and the federal 25C and 25D credits have expired. Participation in the TECH Clean California contractor network is required for most rebates, which narrows the installer pool to enrolled firms.

Cross-check every shortlisted firm against the CSLB database and rebate-network lists before signing a contract.