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In a 2023 review, a customer said three other companies had told them their AC couldn't be fixed; Bertram spent 3+ hours and many parts on it, and the customer wrote that it was running and had saved them 10k. ISLAND MECHANICAL SERVICES LLC is a heating and cooling business, and its website says it has been in business 15 years and offers free estimates. A 2023 customer said the company replaced a heating system when temperatures dropped and that the price stayed true to the quote. A 2023 customer said Bertram and his assistant put in a new furnace and cooling system after the old furnace stopped working and completed the job on time. A 2024 customer on Angi said Bertram laid cloth to protect the flooring while bringing the old and new boiler in and out. In 2022, a customer wrote that over more than four years they had hired Bertram to replace boilers, furnaces and water heaters. On Google it holds 5 stars from 13 ratings, and on Angi 5.0 from 20 ratings. A 2019 customer said Bertram made a repair the same day and charged a reasonable price. A 2025 customer thanked Bertram for fixing a heating system and said they no longer had to go in daily to reset it.
Thank you, Bertram, for fixing our heating system! We have not had it working like this for years. It's great not to have to go in daily to reset it. Your professionalism is outstanding!
Have had Bertram out a couple of times. He responds quickly, does a thorough job, and has been very good at fixing our issues.
Bertrand was very efficient and knowledgeable regarding my thermostat issue. I would recommend him without reservation!
Very responsive and knowledgeable. Fairly priced
Bertram was very professional and very careful with bringing in and taking out old and new boiler. When coming in and out layed cloth to protect flooring etc I highly recommend him. I was given several quotes in a timely manner and he was very honest and helpful in helping me to make my decision to have him install the bolier. Will recommend him to friends and family.
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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 ISLAND MECHANICAL SERVICES 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
Water heater delivered and installed the same day5.0
Boiler replacement where Matt ruled out a chimney liner4.6
Water heater repair4.6
Gas furnace valve for $500 less than another quote3.5