Warren, CT8 Sandcastle Rd, Warren, CT 06754
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Siddall Heating & Cooling By Design, LLC describes itself on its BBB page as providing installation, maintenance, repairs and replacement of heating and cooling units. The BBB grades it A+. A recent customer said a large chunk of ice fell and crushed two A/C compressors at their office, and that Siddall did a quick job replacing them. A 2022 customer said that after repairs to their HVAC system and the installation of two upgraded setback thermostats three years earlier, Siddall had been unresponsive to multiple requests for service. That customer said they had spoken with the owner several times and been promised callbacks that never came.
A large chuck of ice fell and crushed 2 A/C compressors at my office and they did a lovely and quick job of replacement....thank you
After repairs to my HVAC system 3 years ago and the installation of two upgraded setback thermostats. Siddall has been unresponsive to my multiple requests for service. I've spoken with the owner several times, been promised callbacks and have been ignored every time. If you're interested in good and responsive service DO NOT USE SIDDALL! Apparently their website requires a 1 to 5 star rating to post so I gave them 1 star which is much more than they deserve.
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1 change recorded — last scanned Oct 30, 2026.
Typical Connecticut range for this kind of work, from regional averages — not a quote from Siddall Heating and Cooling LLC.. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$4,700 – $10,700
Typical HVAC project around $7,700
New pump and plumbing within two hours of a failure4.7
Issues diagnosed by Gary over the phone3.3
Old fiberglass-lined ductwork replaced4.2
