Mason Air provides a full range of HVAC installation and maintenance services to customers in the Greencastle, PA area. With over 20 years of experience, owner/operator Don Mason has the expertise required to handle your HVAC installation and maintenance needs, and get the job done right the first time. In fact, we're so confident in our workmanship that we offer a full 2 year labor warranty on all installation jobs.



From thermostat installations to full-on new construction jobs, we do it all.

We can diagnose and repair virtually any issue that plagues your air conditioner or heat pump.



Don and his crew arrived on time and deployed on the job like a well-planned, well-executed military operation. Every one displayed professionalism at every step of the project. When the project was completed, Don and his crew made sure that every thing was picked up and the work areas were left clean. The system is working like a dream. Truthfully, I didn’t expect it to be any other way. Don does a great job and is a very nice guy to boot.
— Gary W. in Gettysburg, PA
Don is a very friendly contractor. Very nice to work with. Very fair with his charges. Does not leave the job until he is satisfied it is working correctly. Responds immediately to look at your problem. I have used Don a number of times in the past year. I would recommend him to anyone.
— Norris H. in McConnellsburg, PA
Completely satisfied with Mason’s knowledge, communication, prompt response and follow-through. He discovered the cause of my furnace malfunction and showed me what it was, found the part I needed quickly and installed it in no time.
— Tim C. in Waynesboro, PA
Very satisfied with his skill and job knowledge. He replaced the fan motor and performed a system check providing me with additional helpful information.
— Charles J. in Chambersburg, PA