Smart thermostats learn a household's patterns and adjust heating and cooling according to when a home is occupied, give homeowners the ability to control the thermostat remotely, and enable homeowners to reduce their energy use, saving you money.

The SEER2 (seasonal energy efficiency ratio) is a measure of the efficiency of your heating and cooling system.The higher the SEER2 rating, the more efficiently a unit operates. The SEER2 rating of any given unit can range anywhere from 13 to 21.

It’s ideal to service your cooling system each spring and your heating system each fall to ensure you find small issues before they become big problems.

Your filter should be changed every one to three months, depending on conditions in your home and your region’s climate.

We work built relationships with several lenders to ensure our customers are able to restore comfort in their homes. Ask your technician about your financing options.

The size and complexity of your HVAC issue will determine the cost. Because our trained, licensed HVAC technicians must diagnose the issue before we are able to quote you an accurate cost, we require an appointment to be set to complete a diagnostic on your system. Once the diagnostic is complete, your One Hour® technician will walk you through all costs using our Straightforward Pricing® Guide so there are never any surprise fees.

Yes, we offer emergency services 24-hours a day, year-round.

C repair costs in Mission Viejo vary based on the issue — a minor fix like a capacitor replacement is far less than a major repair like a compressor or refrigerant leak. Because an accurate quote requires a technician to diagnose the system first, we complete a diagnostic, then walk you through every cost up front using our StraightForward Pricing® Guide before any work begins. You'll never see a surprise fee.

Most residential system replacements in South Orange County are completed in a single day. A straightforward AC or furnace swap typically takes four to eight hours. Larger projects — like adding ductwork, relocating equipment, or installing a full heat pump system — may take a second day. We'll give you a clear timeline before we start.

A good rule of thumb: if your system is over 10–15 years old, the repair costs more than half the price of a new unit, or it's needing frequent repairs, replacement is usually the smarter investment. Newer high-efficiency systems also lower your monthly energy bills. If you're unsure, our technicians will give you an honest assessment of both options — we never pressure you toward a replacement you don't need.

Yes. Every One Hour Heating & Air Conditioning technician is fully licensed, insured, and background-checked. We're trained to work on all major heating and cooling brands, and we treat your home with the care and respect it deserves.

We offer same-day and 24/7 emergency service throughout Mission Viejo and South Orange County, 365 days a year. When your AC fails during a summer heat wave or your heat goes out on a cold night, we prioritize getting a technician to your home as fast as possible.

This is one of the most common calls we get in summer. It's often caused by a dirty air filter, low refrigerant, a frozen evaporator coil, a failing capacitor, or a dirty condenser unit. Some of these you can check yourself (start with the filter), but refrigerant and electrical issues require a licensed technician. If your system runs constantly without cooling, turn it off to prevent further damage and give us a call.

In our climate, a well-maintained air conditioner typically lasts 12–15 years. South Orange County's heavy summer use and coastal salt air can shorten that lifespan, which is why regular maintenance matters. If your system is approaching this age and starting to need repairs, it's worth planning ahead for a replacement before it fails during peak season.

Yes. Our maintenance agreements include scheduled seasonal tune-ups that keep your system running efficiently, catch small problems before they become expensive breakdowns, and extend the life of your equipment. Members also receive priority scheduling and discounts on repairs. Ask us about enrolling.

We 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.

We offer whole-home solutions including high-efficiency air filtration, UV purification, HEPA media cleaners, and humidity control. These are especially valuable in South Orange County during Santa Ana wind events and wildfire smoke season, when outdoor air quality drops. A technician can assess your home and recommend the right combination for your needs.

You don't need to shut it off, but Santa Ana winds blow dust, debris, and ash into your condenser unit and clog your air filter faster than usual. After a major wind event, it's worth checking and replacing your filter and having the outdoor unit cleared of debris. If you notice reduced airflow or your system working harder afterward, schedule a maintenance visit.

Our licensed technicians repair and maintain all major heating and cooling brands, regardless of who originally installed your system. For new installations and replacements, we'll help you select the right high-efficiency equipment for your home and budget, and explain any available California utility rebates.