J. Kiesiner Mechanical LLC

A customer whose AC was not cooling says two other companies looked at it and called it working, and that John took his time to diagnose the problem and fixed it right away. J. Kiesiner Mechanical LLC describes itself as a plumbing, heating and cooling company in Central Massachusetts, handling plumbing, gas piping, water heaters, boilers, furnaces and ductless systems. Google shows 5 stars from 82 ratings. A recent customer with an emergency says he came and stayed until the job was finished, and that his prices were very good. A 2025 customer with a basement flood from a blown water line said he was on-site within 2 hours, on a weekend, and came back the following day to pressure test the suspect line, which turned out to have two leaks. A 2025 customer wrote that Jon repiped their basement plumbing and the plumbing under the kitchen sink and shower. Heating and cooling work runs alongside the plumbing. A 2026 customer said John came late on a very cold winter evening and quickly repaired a leaky pipe that led to their 32-year-old boiler. That 2026 customer later wrote that John came back to fix mini splits another company had installed, which were leaking refrigerant and oversized for the rooms. A 2024 customer whose mini-split had no cooling said John helped replace all the piping and neatly dressed it inside the garage. A 2023 customer said John installed a Mitsubishi Hyper Heat unit at their house. A 2024 customer whose furnace stopped working said John was out within 24 hours to diagnose it, went over all the options when a new furnace was needed, and took the service call off the price. A 2023 customer said Jon came out the same day when their boiler/water heater died, had them running the next day with a new hot water heater, and corrected issues left by prior installers at no charge. A 2025 customer said the whole job cost less than half the price of a few technicians in town, with no outrageous fee for looking at it after hours. The company's website states 20 years in business and names Worcester, Northbridge, Marlborough, Sterling, Leicester, Westborough and Framingham as its service area.