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Caswell & Sons Plumbing Heating & AC, LLC says on its website that it answers after-hours emergencies around the clock across Eastern Connecticut. It lists a service area that includes Windham, New London, Tolland, Colchester, Columbia and Coventry, and says it has been in business 16 years. A recent customer said that when their boiler went out at seven below zero, Kevin Caswell arranged everything within a week and the boiler was replaced in one day. A recent customer called Kevin at 10am about a bad water heater and had the old one removed and a new one installed before 4pm the same day. A recent customer whose well supplies their home and farm said they came within 5 hours and replaced the well pump before the close of business. On the cooling side, a recent customer said Caswell & Sons installed two splits in their home, cleaned and made sure they knew how to operate the systems before leaving. A recent customer said HVAC was installed in their home in one morning, without a lot of noise or dust. A recent customer said they replaced pipes and the main drain pipe quickly and under budget. A recent customer said Kevin does custom home plumbing installs on their new construction projects, and a recent customer who owns multiple rental properties said Kevin does all their heating and plumbing. A recent customer called on a weekend, said the owner took the call, and had the service completed the next day. A recent customer said Caswell & Sons arrived when they said they would and cleaned their furnace. Its Connecticut plumbing licence, PLM.0288811-P1, is active, held by Kevin S Caswell.
My boiler went out, it was seven below zero and I needed help. I called Kevin Caswell and him and his people arranged everything within a week and replace my boiler in One day! and it's worked fine ever since I just had one problem, a sensor had gone bad and it wouldn't start 3 years later. I made the call, next day it was like Family came to check on my problem. Fixed before a week! The Caswell company is AAA OnePlus! very courteous, very professional, and very proficient at all forms of home solutions.
The team was friendly and professional. They replaced pipes and my main drain pipe quickly and under budget. I was so happy with the results that I planned two more jobs right after. I would highly recommend them!
friendly, knowledgeable. Two sons arrived on time, respectful, completed task in a reasonable timeframe, and didn’t leave a mess. Nice to have quality plumbers in town. Highly recommended.
Called on weekend and the owner took the call! Service completed the very next day at my request. A real Pro did the work in no time, and no mess left behind. This is what I would call real service.
Nothing is more frustrating to wake up to than having no water! Our well not only supplies our home, but also our farm. They were our first and only call. While we have never used their services in the past, they came to access our situation within 5 hours and replaced our well pump before the close of business! The crew that completed the job were knowledgeable, efficient and respectful. Highly recommend!
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2 changes recorded — last scanned Oct 30, 2026.
Typical Connecticut range for this kind of work, from regional averages — not a quote from Caswell & Sons Plumbing Heating & AC, 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
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Water heater delivered and installed the same day5.0
Boiler replacement where Matt ruled out a chimney liner4.6
Water heater repair4.6
No-heat call answered within 2 hours4.2
Waste oil heater issues found and fixed2.8