Cornerstone Heating And Air Conditioning, Inc.

01/07/2026

Craning a baby unit in Frederick, Md on this beautiful morning in January. MATR craning & Rigging doing it right.

01/01/2026

I would like to take this opportunity to express our sincere gratitude to all our valued customers for a remarkably busy year. We appreciate your continued patronage. To our oil heating customers, I offer my sincerest apologies for the delay in commencing our cleaning services. We will be initiating this process shortly. The recent heating season brought an unprecedented volume of boiler installations, which necessitated our immediate attention. We will be contacting you soon to schedule an appointment. We wish you a pleasant evening and safe travels. We look forward to serving you in the new year. Mike Grissom & David Puddy

08/20/2025

Thank you to all of our Customers, we are celebrating 20 years in Business as of this month. It's been a long road but grateful for all that came with us. Thank you all! We will continue to strive to better our knowledge so that we can serve you better!

07/07/2025

Everyone stay cool today. Are you having AC issues, call Cornerstone!

06/20/2025

It's that time of year again! Your daily vote or two would be greatly appreciated if we have delivered a good experience for you.

Click here to view this image from FrederickNewsPost.com .

06/12/2025

But, but, but... their price was cheaper than yours!

06/12/2025

Some of my competitors keep me busy year round!

04/20/2025

12/25/2024

MERRY Christmas to All!

11/05/2024

08/02/2024

Just a reminder to all that the Frederick News post Best of Frederick 2024 voting has started today and goes for a week. Please consider voting for us. we are Just a small 2 man operation that does a whole lot of work for Frederick County, Maryland and surrounding areas for 19 years now. We have been thru good times and bad times with you all. We are all Frederick County, born and raised here and went to school here. We do our best to take care of all of our customers needs. We certainly aren't perfect, but we have done our very best to keep our clients systems working as best as possible. Again, please consider voting for us, you can vote once a day per email address. We appreciate every vote. Thank you.
Mike G.

07/29/2024

We are still looking for a Helper or a install tech. Anyone interested email a Resume to [email protected]