HVAC Services in Alexandria

50+ Years Serving Northern Virginia. NATE-Certified. 2025 Carrier Presidents Award.

Since 1958, Air Treatment Heating & Cooling has served Northern Virginia homeowners with reliable, full-service heating and cooling. As a family-owned, NATE-certified Carrier dealer and recipient of the 2025 Carrier Presidents Award, we bring credentialed experience to every service call in Alexandria, VA. Our technicians provide upfront quotes before any work begins, and free estimates come standard on new equipment.

Alexandria’s hot, humid summers and variable winters place real year-round demands on residential HVAC systems. Whether you’re dealing with an unexpected breakdown or planning a full system upgrade, our team is ready to help.

Comprehensive HVAC Services in Alexandria, VA

Our Alexandria HVAC services cover everything a homeowner needs, from a quick repair to a full system replacement. We use high-quality equipment, assess each home individually, and tailor our recommendations to your layout, insulation, square footage, and comfort goals. No job is too large or too small.

Keeping up with seasonal maintenance reduces the likelihood of breakdowns during peak demand periods. Northern Virginia’s fluctuating temperatures and humidity place continuous stress on both cooling and heating systems, making regular tune-ups, safety checks, and cleaning an important part of protecting your investment. When installation or replacement is the right call, our technicians align every project with current City of Alexandria building codes, walk you through any permitting requirements, and provide a free estimate so you can plan with confidence.

Our HVAC services in Alexandria, Virginia include:

• AC Repair: We diagnose and resolve cooling issues quickly to restore comfort during hot, humid Alexandria summers.
• AC Maintenance: Regular maintenance helps prevent breakdowns and improves the energy efficiency of your air conditioning system.
• AC Replacement & Installation: Upgrading your system can improve comfort, boost efficiency, and support compliance with local building codes.
• Heating Repair: Our technicians address problems with furnaces, heat pumps, and other heating equipment to keep your home warm and safe.
• Heating Maintenance: Seasonal tune-ups keep your heating system running reliably all winter, reducing the risk of emergency repairs.
• Heating Replacement & Installation: We guide you through selecting and installing the right system for your space, with Alexandria’s seasonal demands in mind.
• Furnace Repair & Replacement: We inspect, repair, or replace furnaces with a focus on safety and long-term cost savings.
• Heat Pump Repair & Replacement: Our team works with traditional and modern heat pump systems to help you find the right fit for year-round comfort.
• Water Heater Repair & Replacement: We resolve problems quickly and complete new installations so you have hot water when you need it.
• Indoor Air Quality Solutions: We assess your home and recommend improvements to reduce allergens and support a healthier living environment.

What Causes an Air Conditioner to Freeze Up?

When your AC freezes up, the most common cause is restricted airflow from a dirty air filter. Without warm air moving freely over the evaporator coils, those coils get too cold and ice over. If a dirty filter is the culprit, replacing it can often solve the problem. In other cases, a frozen AC can point to low refrigerant levels, damaged ductwork, a malfunctioning blower fan or motor, or a clogged condensate drain. When that’s the case, you’ll want to contact our Alexandria AC repair team to get the system running properly again.

A frozen unit is one of the more common signs of a problem with your system, but it isn’t the only one.

Signs your AC needs repair:

• The system is blowing warm air
• You hear unusual screeching, whistling, or banging noises when the AC is running
• The air quality and humidity levels in your home have changed
• You notice unpleasant odors coming from the unit
• The system has developed a leak
• Temperatures are uneven from room to room

Why Does My Furnace Keep Turning Off?

A furnace that shuts off unexpectedly can leave your home cold fast. The most common causes include a clogged air filter, a faulty thermostat, blocked vents, a damaged motor, or a dirty flame sensor. If your furnace is cycling on and off in quick bursts, that’s short cycling, which typically points to an incorrectly sized furnace, an overheated system, or a filter or vent issue.

Short cycling and unexpected shutdowns are two of the more common furnace problems, but they’re not the only ones.

Common furnace problems:

• Worn blower belt and bearings
• Cracked or damaged heat exchanger
• Faulty limit switch
• Malfunctioning pilot light or ignition
• Damaged capacitor
• Neglected maintenance
• General wear and tear

If any of these sound familiar, reach out to our NATE-certified technicians at Air Treatment Heating & Cooling. We can identify and resolve the issue before it worsens or causes further damage.

When to Replace Your HVAC System in Alexandria

Most homeowners wait until their system fails completely before considering replacement. That usually means higher utility bills, reduced air quality, and a string of escalating repairs in the months leading up to the breakdown. Understanding the warning signs early makes replacement a planned investment rather than an emergency expense, and that matters in a climate like Alexandria’s, where both your cooling and heating systems work hard year-round.

If you’re weighing whether to repair or replace, watch for these:

• Rising energy bills without changes in usage, which can signal declining efficiency
• Frequent repairs or increasing downtime, even after recent service
• Unusual noises or odors coming from the equipment while running
• Uneven temperatures or humidity levels throughout the home

Replacing older equipment with a modern, energy-efficient system can help lower your monthly costs and maintain more consistent indoor comfort as seasons shift. New systems are built to meet current efficiency standards and City of Alexandria building code requirements, and many include features like programmable thermostats, improved filtration, and quieter operation.

Your Alexandria HVAC Contractor for Every Comfort Need

Air Treatment Heating & Cooling is your local resource for heating, cooling, and indoor air quality solutions throughout Northern Virginia. We carry BBB accreditation and Angie’s List recognition, offer financing through Synchrony and Wells Fargo, and regularly share coupons and specials to help Alexandria homeowners get the most from every service call. Our NATE-certified technicians have been earning the trust of this community for over 50 years.