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. Appointment timing depends on the current schedule.
Appointments depend on current availability · Open Mon–Sun · 8:00 AM – 6:00 PM.
Local scheduling
Service in Diamond Bar and across the East LA County. Call during business hours to confirm the next available appointment.
Book a specific service in Diamond Bar
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
AC repair for major system types, with appointment availability confirmed before scheduling.
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.
Appointment availability in Diamond Bar varies by day. Call during business hours and we will confirm the next available time before you book.
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.
- EPA-certified technicians
- Honest, upfront pricing — no hidden fees
- Appointment availability confirmed by phone
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.
Clear scheduling
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.
We also serve the East LA County
HVAC repair, installation and maintenance in Diamond Bar and these neighboring communities.
Need HVAC service in Diamond Bar?
Written pricing, EPA 608-certified expertise, and appointment timing confirmed before you book.