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97% Recommended

6 Years In Business

Company Details

  • Verified Licenses


  • Mon: 8:00 AM - 4:00 PM
  • Tue: 8:00 AM - 4:00 PM
  • Wed: 8:00 AM - 4:00 PM
  • Thu: 8:00 AM - 4:00 PM
  • Fri: 8:00 AM - 4:00 PM
  • Sat: Closed
  • Sun: Closed
View All Details & Credentials


Service Details

  • Residential Work

Areas of Expertise

  • Air Conditioning Install/Repair
  • Furnace Install/Repair
  • Heat Pumps
  • HVAC
View All Offerings and Cities Served

Cost Information

  • Free Estimates
  • Warranty Offered
  • Trip Charge May Apply
  • Credit Cards Accepted


142 Verified Reviews
  • 5
  • 4
  • 3
  • 2
  • 1

Highly rated for

  • Quality
  • Value
  • Customer Service
Showing 1-10 of 142 reviews Showing 0 reviews
5.0 Warren G. Sykesville, MD

Totally awesome experience. They found problems with my old installation I was unaware of (Collapsed low-pressure tubing at the entrance and exit of my home). The Installers were able to correct the problem by replacing the tubing inside my home. This was not part of the original Quote. It was done without question and at no additional charge. A truly great experience. I would recommend them to anyone that wants a professional installation at a fare price.

5.0 Bill M. Taneytown, MD

Very responsive and helpful.

5.0 Matthew V. Brunswick, MD

Despite a snow storm, they had a flexible schedule to check on my heat pump, which is for a mini-split/ductless heating/air conditioning system. The worker was able to quickly determine the problem and explain it to me in a manner that made sense. The worker also recommended coverings for the tubing on the side of my house for my system, as I didn't have any but wanted to get some installed. The company was flexible enough to both repair the heat pump compressor and on the same day get the covers installed. The process was quick.

Response from Company:

Thanks for the review Matthew. Really appreciate you taking the time to write these kind words!

5.0 John B. Middletown, MD

Great company to do business with. They came out same day to assess what was wrong with my heating system. The furnace needed replaced and the crew was out here the next day to install the new unit. The crew was very nice and respectful of our house. I would highly recommend using Tetteris!

Response from Company:

Thank you for your kind words John! We really appreciate it!

5.0 Jeff B. Pasadena, MD

Very professional and only trying to sell you what you need. Had our furnace and AC replaced and couldnâ t be happier. They were able to squeeze us in ASAP so our family wouldnâ t be without heat.

5.0 John L. Quinton, VA

Good honest estimate. Mike fully explained what happened to the old system and why. Helped me weigh the cost of a new unit vs nickel and diming the old one. Couldnâ t be happier with the result

5.0 Ben W. Frederick, MD

Mike and his crew are very responsive Courteous and very professional. They work quick and go the extra mile to do it right. Mike didnâ t try to oversell me on stuff I didnâ t need. I donâ t normally write reviews unless Iâ m extremely dissatisfied or extremely impressed. I will definitely recommend this company.

5.0 Ronald M. New Market, MD

Project done professionally and timely. All involved were professional and courteous.

5.0 Mike E. Brunswick, MD

Prompt and informative service.. highly recommend.

5.0 Martha M. Sykesvillle, MD

The men were polite, professional and the price was great.


Tetteris Heating & Air
Goodman AC & Heating
HVAC install and service

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