HVAC Service in Santa Ana, CA

Reliable Heating & Cooling From a Family-Owned HVAC Company

Choosing someone to work on your HVAC equipment means inviting a team into your home or business. We take that responsibility seriously. 20th Century Air is a family-owned and operated HVAC company that has grown through word of mouth since 1987. Many of our new customers call us because a neighbor, friend, or contractor told them about our honest, no-pressure approach.

Our philosophy is simple. We combine state-of-the-art products and diagnostic tools with service values that feel personal and straightforward. That means we show up when we say we will, we explain what we find in clear language, and we give you options instead of pushing a single solution. If a repair is a sensible choice for your older system, we say so. If replacement will likely save money and trouble over time, we walk through that with you and let you decide.

We hold an A+ rating with the Better Business Bureau, and our company has hundreds of positive online reviews that mention professionalism, punctuality, and fair pricing. Our technicians wear identification, use shoe covers inside, and treat every property as if it were their own. Whether we are meeting a homeowner for the first time or supporting a long-standing commercial client, we work to earn and keep your trust on every visit.

Full-Service HVAC Solutions for Santa Ana Homes & Businesses

Comfort needs look different from one property to the next. Some customers call us because a single room is always too hot. Others are planning a full system replacement or managing the comfort of an office or retail space. Our team is equipped to handle all of these situations, which means you can rely on one partner for nearly any heating and cooling need.

We provide comprehensive services that cover the full life of your system. That includes troubleshooting and repair, new equipment installation, complete system replacement, preventative maintenance visits, ductless mini-split systems, indoor air quality solutions, and commercial HVAC support for office buildings, retail spaces, and homeowners associations. Our technicians work on many major makes and models, and we bring advanced diagnostic tools to every job so testing and adjustments are accurate.

Because we serve a mix of residential homes, new construction projects, and managed properties across Orange, Los Angeles, and Riverside Counties, we understand how different buildings behave in the local climate. Our team is recognized as a top Orange County installer for new heaters and air conditioning systems, which reflects the volume of successful projects we complete each year. We also offer comprehensive maintenance plans to ensure that your HVAC is in top shape year-round.That experience helps us recommend system sizes and configurations that fit the way people actually use their spaces here.

What To Do When Your HVAC System Starts Acting Up

A noisy unit, rooms that will not cool down, or air that suddenly feels weak can all create stress, especially during a hot spell. Knowing a few simple steps to take before you call can save time and help our team help you faster. It can also prevent small problems from turning into bigger ones.

If you notice a comfort issue, start with a quick visual check of your thermostat settings, making sure it is set to cool or heat as needed and set to the correct temperature. Take a look at your air filter and replace it if it is visibly dirty, since a clogged filter can restrict airflow. If you can safely reach your electrical panel, confirm the HVAC breaker has not tripped. If you hear scraping or grinding noises, smell burning, or see ice on the equipment, it is usually best to turn the system off and call a professional.

When you contact us, it helps to share what you have already checked, how long the issue has been happening, and whether you have noticed any patterns, such as certain rooms being worse than others. Our technicians arrive ready to perform a full inspection, explain what they find in plain terms, and outline any repair and replacement options. You receive a clear estimate before we begin work, and we are always available to answer questions while you decide what is right for your home or business.

How Our Local Team Serves Santa Ana’s Climate & Codes

Heating and cooling in this part of Orange County is shaped by long, warm seasons and mild winters. Air conditioners and heat pumps often run for many hours a day during the hottest months, and poorly designed systems can struggle to keep up or lead to high utility bills. When we design, install, or tune systems, we keep this local reality at the center of our recommendations.

Our team works with energy-efficient equipment that is sized and configured for the way homes and small businesses here are built. We pay attention to insulation levels, duct layout, and window exposure, since all of these affect how hard your system has to work. We also offer smart thermostat solutions and modern controls that make it easier to match your schedule and reduce wasted energy. These tools give you more control over comfort and costs over the life of the system.

California has specific energy regulations, including Title 24 requirements for efficiency. We stay current with these standards and incorporate them into our installation and replacement projects. That means the systems we install are selected and set up with compliance in mind, which helps support permits and inspections. If you are upgrading equipment, we discuss how efficiency ratings, any rebates that may be available, and long-term operating costs fit together for your particular property in this area.