Meet the expert
Yuan Pan
Owner & Lead HVAC Technician, Alex Air & Heating
Yuan Pan is the owner and lead technician at Alex Air & Heating Services LLC and holds EPA 608 Universal certification. He and the team repair and install heating and cooling systems across Ontario, the Inland Empire and East Los Angeles County every day — so this advice comes from real jobs, not generic filler.
EPA 608 Universal CertifiedLicensed to safely handle all refrigerant types (Clean Air Act, Section 608).
Owner & lead technicianHands-on, in-home diagnosis and installs — not a call center.
Local to the Inland EmpireServing Ontario, Pomona, Diamond Bar, Walnut, Claremont & East LA County.
Registered California LLCAlex Air & Heating Services LLC — real jobs, honest pricing.
Recent guides by Yuan
Buying GuideDuctless Mini Split Installation Cost in 2026: California Prices by Zone ($3,000-$15,000)9 min readBuying GuideDuctless Mini Split Pros and Cons: 8 Facts Before You Buy (2026 SoCal Guide)9 min readBuying GuideHow to Size an Air Conditioner: Why Manual J Beats the Square-Foot Rule (2026)10 min readBuying GuideAC Repair vs. Replace in 2026: The Age Rule, the $5,000 Rule, and R-410A Costs9 min readCoolingOne Room Always Hot? How to Fix Uneven Cooling in Your Home9 min readMaintenanceThe Real HVAC Tune-Up Checklist: 12 Things a Pro Actually Checks (and 5 You Can DIY)17 min read
Read all HVAC articles Ready when you are.
Same-day service, honest pricing, and EPA-certified technicians who get it right the first time.