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CSM Heating & Cooling works on home heating equipment. In a 2023 Google review, a customer said Cal picked up right away when they called about an issue with their boiler unit, came over the next morning and fixed the problem right away. In a 2022 Google review, a customer said their furnace started leaking and had several other issues, and that Cal fixed the issue within the hour. A Maine HVAC licence, number MS30020107, held by CALLAHAN SHAW MILLER is active on the state registry.
I highly recommend Cal to anybody , I've called with an issue with our boiler unit and he picked up right away. He came over the next morning and fixed the problem right away. He's very knowledgeable and very responsive
our furnace started leaking and had several other issues Cal was very knowledgeable, responsive and fixed the issue within the hour. He knew exactly what to do and didnt waste any time. We would definitly use him for all of our heating and cooling issues or upgrades!
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1 change recorded — last scanned Oct 30, 2026.
Typical Maine range for this kind of work, from regional averages — not a quote from CSM Heating & Cooling. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$4,500 – $10,300
Typical HVAC project around $7,400
Seasonal home opening and closing4.7
Burst water tank fixed by noon4.5
Transparent pricing4.3
State-verified HVAC licenseNot yet rated
