AC Replacement You Can Trust, Comfort, Efficiency & Peace of Mind

When it’s time for a new air conditioning system, Dave’s Heating & Air makes the process clear, comfortable, and hassle-free. We help you choose the right system for your Reston home — then install it cleanly, correctly, and built to last.

A New AC Isn’t Just an Upgrade — It’s a Long-Term Investment

Replacing your air conditioner isn’t something you do often, and it shouldn’t feel overwhelming. Whether your current system is aging, breaking down repeatedly, or struggling to keep up with the summer heat in Reston, our team walks you through every option.

We look at your home, your comfort needs, and your long-term goals not just the price tag. The result? A system that fits your space, your budget, and your family’s comfort for years to come.

How Dave’s Helps You Choose the Right System

Every home cools differently. Square footage, insulation, ductwork, windows, sun exposure they all matter. That’s why we never recommend a system until we evaluate your home and understand how you live in it.

During your estimate, we’ll review:

Home size & layout to determine proper sizing
Energy-efficiency goals and monthly budget
Current ductwork condition and airflow needs
Noise levels, humidity control, and comfort preferences
Available rebates or incentives

Don't Wait Until Your AC Fails Completely

When it’s time to replace your AC, Dave’s Heating and Air Conditioning makes it simple. Our local HVAC technicians help you choose the right system, install it clean, and keep your Northern Virginia home comfortable for years to come.

Our Installation Standards

A new AC system is only as good as the installation behind it. At Dave’s, we don’t cut corners ever. Our technicians follow detailed installation standards to ensure your new system performs at its highest efficiency from day one.

Every AC installation from Dave’s includes:

• Airflow and static pressure testing
Ensures your new system can move air properly throughout your home.

• Correct refrigerant charging
Proper charging is essential for cooling speed, efficiency, and system longevity.

• Clean, secure line-set work
No sloppy bends or messy connections just clean, professional craftsmanship.

• Safety, leak, and performance testing
Your home’s comfort and safety come first.

• A full walkthrough after installation
We show you how everything works, answer all questions, and ensure you’re confident in the system we’ve installed.

This is what “done clean, done right” truly means.

What Homeowners Love About a New System

Modern AC systems offer comfort improvements that older units simply can’t match. After installation, most homeowners notice:

More even cooling throughout the home — no more hot spots.
Lower monthly energy bills due to higher efficiency.
Quieter operation, especially outdoors.
Better humidity control, even on the muggiest days.
Improved indoor air quality when paired with proper filtration.

It’s a difference you can feel every day and one that continues paying off summer after summer.

We’ll never pressure you into replacing a system if a repair is a better option. If your unit still has life left and the repair is safe, reasonable, and cost-effective we’ll tell you.

Honest advice is part of who we are. We treat your home like our own.

Financing & Options That Fit Your Budget

An AC replacement is a big investment, but it shouldn’t be a stressful one. Dave’s offers flexible financing options designed to make upgrading easier and more affordable.

Whether you want low monthly payments or promotional interest-free plans, we’ll help you choose the option that works best for your household.

area we serve

Aldie
Annandale
Ashburn
Berryville
Brambleton

Burke
Centreville
Chantilly
Fairfax
Fairfax Station

Falls Church
Great Falls
Hamilton
Herndon
Leesburg

Lovettsville
McLean
Merrifield
Potomac Falls
Purcellville

Reston
Round Hill
Sterling
Tysons
Vienna

Why Homeowners Choose Dave’s

Experience You Can Feel

We’ve served Northern Virginia homes for 50 years.

Fair, Upfront Pricing

No upsells, no hidden fees just straight answers.

Local & Reliable

Based right here in Sterling, ready when you need us.

Respectful Service

We treat every home like it’s our own.

Some systems reach the point where another repair just isn’t worth it. If that’s the case, we’ll walk you through honest options for replacement, including energy-efficient models that can lower your monthly bills. No pressure — just clear advice from people who care about doing what’s right for your home.

Keep Your HVAC System Running Smoothly

Dedicated to Your Comfort Since 1975

Air conditioning is essential, especially during the intense summer heat we experience in Northern Virginia. When your system isn’t working as it should, Dave’s Heating and Air Conditioning is here to help.

We specialize in a full range of residential and light commercial AC services, from quick repairs to complete system replacements.

Our team is well-versed in servicing and installing a variety of top brands, ensuring your system operates at peak efficiency.

With nearly five decades of experience, we take pride in delivering transparent service and lasting results to Reston, Herndon, Sterling, and across Northern Virginia. Trust us to keep your home or business cool and comfortable.

Call 571.346.3940 and let’s fix your AC issues.

Hear It from Our Happy Customers

Nothing makes us prouder than hearing directly from the wonderful people we serve right here in Sterling, Herndon, Reston and Northern Virginia. Our reputation is built on knowledgeable technicians, courteous service, and the promise that we always leave your home as clean as we found it—if not cleaner!

Customers regularly praise our team for arriving on time, delivering expert system installations and repairs, and ensuring the whole process is seamless from start to finish. Whether it’s a complete HVAC replacement or routine maintenance, folks appreciate the extra care and attention to detail we bring. Many even say they’d recommend us to friends and neighbors without hesitation. Now that’s high praise!

      EXCELLENT  
   Based on 193 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Divya Kulkarni 
 
 
 
 Trustindex verifies that the original source of the review is Google. Five stars all the way! Adam did a fantastic job replacing our HVAC — professional, knowledgeable, and tidy, and he took the time to explain everything along the way. Dave's Residential Electrical and Air Conditioning made the whole process smooth from start to finish, and owner Javier clearly runs a company that cares about doing the job right. Our new system is running beautifully. Highly recommend!
  
 
      Posted on Google  
   
   Diane Ludewig 
 
 
 
 Trustindex verifies that the original source of the review is Google. Adam is the best! Efficient, knowledgeable, considerate… represents Dave’s extremely well!
  
 
      Posted on Google  
   
   Janet Lynn Parker 
 
 
 
 Trustindex verifies that the original source of the review is Google. Dave's provides excellent , dependable service. Adam is a great technician. Honest service and products provided at a good price.
  
 
      Posted on Google  
   
   Sherry Brown 
 
 
 
 Trustindex verifies that the original source of the review is Google. I am a realtor and I have had the pleasure of working with Dave’s heating and air for a few of my real estate clients. The team has replaced water heaters, serviced HVAC systems and been a 2nd opinion when needed! Highly recommend having this company as a vendor if you are an agent!
  
 
      Posted on Google  
   
   Tanya Clarke 
 
 
 
 Trustindex verifies that the original source of the review is Google. Adam and his team were very professional and friendly. Once the water heater was installed he walked me through the installation process, showed me how it functions and gave tips for maintenance etc.
  
 
      Posted on Google  
   
   Pauline Montague 
 
 
 
 Trustindex verifies that the original source of the review is Google. From the initial, timely estimate to the install everyone at Dave's was very responsive. The install was seamless and the cleanup was excellent. Even though I know next to nothing about HVAC systems, Adam never let me feel like my questions were silly.  I would highly recommend this company for all of your HVAC needs.
  
 
      Posted on Google  
   
   Paul Curylo 
 
 
 
 Trustindex verifies that the original source of the review is Google. These guys were prompt, professional, fast, and attentive from initial contact to system startup. Highly recommend them for your needs.
  
 
      Posted on Google  
   
   Greg Stavrou 
 
 
 
 Trustindex verifies that the original source of the review is Google. Dave’s did a great job replacing my old gas hot water heater!  Professional and clean work with a choice of Bradford White and AO Smith 75 gallon in stock.  Excellent planning visit, quoting and contracting process. Even a follow up to make sure we are happy!   Thank you Dave’s!
  
 
      Posted on Google  
   
   Jason G 
 
 
 
 Trustindex verifies that the original source of the review is Google. Adam did an excellent job replacing my water heater. He was professional, courteous, and respectful of my home throughout the entire installation. He took care to keep everything clean and made sure there was no mess left behind.

I also really appreciated that he kept me updated throughout the process and explained what he was doing along the way. Once the installation was complete, his team walked me through everything that had been done and made sure I understood the new system before he left.

Overall, it was a great experience. Adam was knowledgeable, professional, and easy to work with. I would definitely recommend him.
  
 
      Posted on Google  
   
   浅川 Asakawaめぐみ Megumi 
 
 
 
 Trustindex verifies that the original source of the review is Google. Today, Adam came to install two UV units. We have been with Dave’s Heating & Air Company for more than 20 years, even through a change in ownership. We still recognize many of their technicians from the old days.

Adam is very knowledgeable about HVAC systems. He is friendly, professional, and clearly takes pride in his work. We were very pleased and grateful to have him help us. Dave’s company is lucky to have employees like Adam.

Dave's air FAQ

How much does AC replacement cost?

AC replacement cost depends on your home’s size, the system you choose, and your ductwork condition. During your free estimate, we review your home and give you clear, upfront pricing before any work begins, no hidden fees.

How do I know if I need AC replacement or just a repair?

If your system is aging, breaking down repeatedly, or struggling to keep up with summer heat, replacement may be the better long-term option. But we’ll never pressure you into a new system if a repair is safe, reasonable, and cost-effective. Honest advice is part of who we are.

What size AC unit do I need for my home?

The right system size depends on your square footage, insulation, ductwork, windows, and sun exposure. We evaluate your home in detail before recommending a system, since an AC unit that’s the wrong size hurts both comfort and efficiency.

Do you offer financing for AC replacement?

Yes. Dave’s offers flexible AC financing, including low monthly payment plans and promotional interest-free options, so upgrading your system doesn’t have to strain your budget.

What's included in a professional AC installation?

Every installation from Dave’s includes airflow and static pressure testing, correct refrigerant charging, clean line-set work, and full safety, leak, and performance testing. We finish with a complete walkthrough so you understand your new system.

What brands of AC systems do you install?

Our technicians are well-versed in installing a variety of top AC brands, so we can recommend a system based on your home’s needs and budget rather than pushing a single manufacturer.

Will a new AC system lower my energy bills?

Most homeowners see lower monthly energy bills after replacing an aging system, along with more even cooling, quieter operation, and better humidity control.

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