Heating & Air Conditioning / HVAC near Lexington Park

“Great company, very responsive and came out and fixed my ac unit very quickly. I can't give their staff enough praise! You won't be disappointed when you choose Great Mills Heating and Air!“

“Richard was our Tech today and he was awesome even took the time to feed our dog biscuits while he was working on our unit. Very very happy with Richard and Boothes.“

“The process was flawless. The installers were quiet, efficient, and polite. They answered all our questions thoroughly and with patience. I will recommend them at any time.“

“Extremely informational and knowledgeable, helped me out a lot with both of my units. Gave me some tips and such on usage, maintenance, and other general stuff. They didn’t just come and get the job done, they made sure I was all good with the work and understood what was done and what any potential problems were prior. They were so helpful that I even decided to get a full new unit install for one that was having issues upstairs (my house has 2 units)“

“After receiving several HVAC quotes, I ultimately chose STA SO COOL to replace my 17-year-old heat pump system, and I couldn't be happier with that decision.

Dave Staso and his team installed a new American Standard Platinum 20 variable-speed heat pump system with zoning, and the entire experience was outstanding from start to finish.

What impressed me most was Dave's knowledge and professionalism. He took the time to thoroughly explain the transition from older R22 refrigerant systems to the new R-454B technology, reviewed efficiency ratings, rebates, warranty options, and helped me understand the long-term value of the different equipment options. There was never any pressure—just honest advice and education so I could make an informed decision.
The installation itself was top-notch. The crew was professional, respectful of my home, and paid attention to the details that most homeowners never see but that make all the difference in system performance and longevity. Dave discussed airflow, ductwork, system commissioning, refrigerant evacuation, pressure testing, and proper setup procedures that many contractors never even mention.

Customer service has been exceptional. Every question I had was answered quickly and thoroughly. After the installation, Dave provided all warranty registrations, AHRI performance certifications, and documentation for my records. It's clear he takes pride in his work and stands behind what he installs.

The new system is incredibly quiet, maintains consistent temperatures throughout the house, and has dramatically improved comfort upstairs. The zoning system and variable-speed technology have exceeded my expectations.

If you're looking for an HVAC contractor who combines technical expertise, honesty, quality workmanship, and outstanding customer service, I highly recommend STA SO COOL. This was one of the best home improvement experiences I've had, and I would not hesitate to use them again or recommend them to family and friends.

Thank you, Dave and the STA SO COOL team, for a job extremely well done! — Tony Trombino ; Leonardtown, MD“

“This company is amazing!!! I’ve had this warranty company for 7 years and I have never had a company so efficient and quick as they were! From dx the problem to following the paperwork protocol and procedures for 2-10 warranty, this man got it all turned in by the next day. I needed a whole new system ,so I was dreading how long all this would take and how much it would cost. It was legit about 2 weeks. I’ve known people that have waited months if not a year! Thankfully my warranty covered most of it! His mannerism, knowledge and friendliness left me happy and pleased with his services. I will be happy to refer him to anyone I know. Please give this company kudos and give them a chance. You will not be disappointed!!“

“Highly recommended! Simmons beat the price quoted by other local companies and installed a new heat pump HVAC system professionally and with attention to detail. Go with this company and you won't be disappointed!“

“Shannon and his staff are next levelBill always makes you feel specialThis is a great company to do business with!they stock penalty of parts and get you stuff fast.This is not for the normal home owner do it yourself kind of personThey are for HVAC professionals and some contractorsThe store is clean and organizedPrices are alway goodI'm am very confident you can always fins something on the internet cheaper for anythinggenerally if your HVAC is down and extra dollar isn't going to make a difference.they alway stand behind the parts they sell.“

“Great service. Very responsive when you need work done. I called them when my system froze up once. He recommended a replacement. I called another local company for a second opinion and that tech wound up letting out a lot of my Freon. When my ac started blowing warm Frank came out the same day I called him and got the system back up. His prices are reasonable and his advice is great. He will be my go to from now on for HVAC work.“