24/7 HVAC Services in Mission Viejo & South Orange County
One Hour Heating & Air Conditioning of Mission Viejo delivers fast, reliable air conditioning and heating service to homeowners across Mission Viejo, Rancho Santa Margarita, Ladera Ranch, Irvine, and the surrounding South Orange County communities. Our licensed, background-checked technicians handle everything from emergency AC repair and furnace troubleshooting to full system replacements — always with upfront StraightForward Pricing® and work that's done right the first time. With 103 five-star Google reviews and round-the-clock availability, we're the local team South County families call when comfort can't wait.
Whether your AC quit during a summer heat wave, your furnace won't fire on a cold January morning, or you're planning a high-efficiency system upgrade, we're ready to help 24 hours a day, 365 days a year. Call 949-464-7748 or book online in under two minutes.
Why South Orange County Homeowners Choose One Hour
24/7 Emergency Service
HVAC systems don't break down on a schedule. That's why we answer calls and dispatch technicians around the clock — including nights, weekends, and holidays — so you're never left sweating through a heat wave or shivering through a cold snap.
You approve the price before any work begins. We diagnose the problem, walk you through your options, and quote a flat rate up front — no hourly surprises, no pressure, no fine print.
StraightForward Pricing®
Licensed, Trained & Trusted
Our company is NATE-certified and EPA 608 certified, and all work is performed under California C-20 HVAC Contractor License #1140696. Our team is fully licensed, insured, and background-checked — credentialed to work safely and expertly on all major heating and cooling brands. We treat your home with respect and back our work with a satisfaction guarantee.
Serving Mission Viejo & All of South Orange County
We're proud to serve homeowners throughout South Orange County, including Mission Viejo, Rancho Santa Margarita, Ladera Ranch, Coto de Caza, Dove Canyon, Las Flores, Trabuco Canyon, Lake Forest, Foothill Ranch, Laguna Hills, Laguna Niguel, Aliso Viejo, Irvine, Dana Point, San Clemente, San Juan Capistrano, Rancho Mission Viejo, and Robinson Ranch. Many of our neighbors live in homes built in the 1970s through 1990s with aging original HVAC equipment — exactly the kind of systems we specialize in keeping comfortable, efficient, and reliable.
Our HVAC Services
From a single repair to a complete system replacement, One Hour Heating & Air Conditioning of Mission Viejo is your full-service HVAC partner in South Orange County.
Air Conditioning Repair & Installation
Fast, accurate AC repair for all makes and models, plus expert installation and replacement of high-efficiency systems sized correctly for your home. We diagnose warm air, weak airflow, strange noises, and complete breakdowns — and get your home cool again, often the same day.
Furnace repair, maintenance, and replacement to keep your home warm through Southern California's cool, damp winters. From igniter and flame-sensor issues to full heating system upgrades, our technicians restore reliable warmth quickly and safely.
Heating & Furnace Service
Heat Pumps & System Replacement
Considering a more efficient, all-in-one comfort solution? We install and service heat pumps and high-SEER2 systems, and we'll guide you through available California utility rebates so you get the most value from your upgrade.
Indoor Air Quality & Maintenance
Whole-home filtration, UV purification, humidity control, and seasonal maintenance plans that protect your equipment, lower your energy bills, and keep the air in your home clean — especially important during Santa Ana wind events and wildfire smoke season.
Schedule Your HVAC Service Today!
Don't wait for a small problem to become a costly emergency. Call 949-464-7748 to speak with our Mission Viejo team, or book your appointment online in just a few clicks. Same-day and emergency appointments are available throughout South Orange County.