HVAC service in Diamond Bar, CA.
Comfort done right in Diamond Bar — same-day AC and heating repair, high-efficiency installs, and honest, upfront pricing you can count on year-round.
Same-day appointments most days · Open Mon–Sun · 8:00 AM – 6:00 PM.
Same-day
Service in Diamond Bar and across the East LA County — call early and we'll do everything we can to get a tech out today.
Your local HVAC team in Diamond Bar.
At Alex Air & Heating Services LLC, we provide professional HVAC solutions with a commitment to quality workmanship, honest pricing, and reliable service.
From AC repair and heating to mini splits, thermostats and preventive maintenance, we keep homes and businesses across Diamond Bar and the East LA County comfortable year-round.
Every HVAC service in Diamond Bar, under one roof.
From a quick repair to a whole-home system replacement — one local team for AC, heating, air quality and maintenance.
AC Repair
Same-day AC repair, all major brands, upfront pricing.
See AC repairHeating Repair
Furnace and heat pump repair for every make and model.
See heating repairAC Installation
Right-sized, high-efficiency AC installation done right the first time.
See AC installFurnace Installation
High-efficiency furnace installation sized for your space.
See furnace installMaintenance Membership
$199/year per system: annual tune-up, 10% off repairs, no overtime fees.
See membershipHVAC in Diamond Bar — FAQs
Yes — Diamond Bar is right in our service area. We provide AC repair, heating, installation, maintenance and commercial HVAC throughout Diamond Bar and the surrounding East LA County.
Yes, whenever our schedule allows. Call us during business hours and we'll do everything we can to get a technician out to Diamond Bar the same day.
No hidden trip charges in Diamond Bar. You'll always get an upfront, written price before any work begins.
Yes. We provide residential and light commercial HVAC service across Diamond Bar and the East LA County.
Serving Diamond Bar & nearby communities.
Diamond Bar, CA — and the surrounding Inland Empire & LA County.
Do we cover your ZIP?
Not sure if you're in our area? Enter your ZIP above — we cover most of the Inland Empire & LA County.
- Licensed & insured technicians
- Honest, upfront pricing — no hidden fees
- Same-day appointments often available
Prefer to talk? Call 626-777-4822
19 cities across 4 regions
Locally owned & operated
An independent local team serving the Inland Empire & LA County.
Same-day appointments
Call during business hours and we'll do everything we can to dispatch a tech the same day.
Fast response times
We answer fast and show up when we say we will.
Need HVAC service in Diamond Bar?
Same-day service, honest pricing, and licensed technicians who get it right the first time.