The Fairfax area is a long run of construction eras: 1950s and 1960s homes near the old city center, then large two-story colonials and townhome communities from the 1970s through the 1990s. Many of the later homes have two systems, one for each floor, and both tend to wear out around the same time.
Larger homes bring larger duct systems, and with them more places to leak: attic runs, unsealed joints and returns that were never big enough.
Common jobs in Fairfax
- Two-system replacements in colonials
- Heat pump upgrades with gas backup
- Duct sealing in attics
- Light commercial maintenance
- Indoor air quality for allergy seasons
Fairfax questions
Asked in Fairfax.
Should I replace both of my systems at once?
Not automatically. If both are the same age and one has failed, it can make sense to plan both, but we evaluate each on its own condition and give you the options in writing.
Who handles permits in the City of Fairfax?
The City of Fairfax runs its own permitting, separate from Fairfax County. Addresses outside the city limits are permitted by the county. Either way, we pull the permit for a replacement.
Do you service light commercial properties in Fairfax?
Yes. We repair, replace and maintain systems for offices, retail spaces and light commercial buildings across Northern Virginia.
Isaac and his partner were awesome. They came on time. Were polite and courteous. Explained each step.they were taking to.fix the problem. They explained with integrity. They were my second opinion to a large reputable company who said that they couldn't fix my AC and immediately wanted to sell me a whole HVAC system. No sales job with Isaac. Just suggestions without any nudging. Integrity Duct and HVAC Services is my go to company. I tried the other company because Integrity was booked and was hot. In the end, we decided to deal with the heat the old fashioned way, fans, until Integrity came. They were worth the wait.
This business and their personnel who I interacted with for my HVAC system replacement really lived up to their company’s name: Integrity. They were Roberto, Isaac, Kristhiam, Oscar and Arnardo— all responsive, knowledgeable and very professional. They go out of their way to provide excellent customer service. Now I have a brand new HVAC system that’s up and running, hopefully for a very long time. Thanks, Integrity!
Great service and competitive pricing. I had a A/C component fail and Integrity was able to come out that evening to take a look. The blower motor had gone bad. They gave me some options including a more cost efficient one given the age of my system. Would definitely call them again for a new install when the time comes. UPDATE 7/2026: My 15 year old unit finally bit the dust and rather than spend more money replacing other components, I went for a new install. Integrity cam out the same day, gave me a very competitive quote, and were able to install 3 days later. Thanks again for the great service and saving me from the heat!
Reviews are quoted word for word as posted on Google, with names as published.