# J. Kiesiner Mechanical LLC

**Trade:** Plumbing · **Phone:** (774) 276-6382 · **Website:** https://jkiesinermechanical.com/ · **Languages:** English

**Rating: 4.6/5** (medium confidence) — from 72 reviews across 3 sources.
100% of sentiment-scored reviews read net-positive. Last 6 months: 6 reviews, 0 negative.

## The honest read

J. Kiesiner Mechanical is a Central Massachusetts plumbing, heating, and cooling company that says it has more than 20 years of experience. Its own site lists rough and finish plumbing, gas piping, water heaters, boilers, furnaces, ductless mini-splits, pumps, and water filters, and names Worcester, Northbridge, Marlborough, Sterling, Leicester, Westborough, and Framingham among the towns it assists. The site also says it is licensed and insured, offers a one-year warranty, includes necessary permits or inspections in its fees, and participates as a third-party Mass Save partner; those are company claims to confirm when booking.

The public review history is deep: Google shows 82 ratings, with 72 reviews collected across 2023–2026. Recent reviewers describe same-day or rapid responses, clear explanations, clean work, and repairs or installations involving boilers, furnaces, air conditioning, mini-splits, water heaters, and plumbing. Specific accounts include replacing a water heater, repiping basement and fixture plumbing, installing Mitsubishi equipment, restoring heat and hot water, and correcting prior installation problems. Reviewers repeatedly mention fair pricing, communication, and follow-through, including returning to check that work was operating properly.

The strongest fit is a homeowner needing plumbing or HVAC diagnosis, repair, replacement, or maintenance and wanting detailed communication. Before booking, confirm the exact license details, project scope, permit responsibilities, warranty terms, equipment model, and whether the requested town and emergency timing are covered; the site does not promise 24/7 service. The website describes complimentary remote quotes or a basic consultation fee, so ask which applies to the job.

**Strengths:**
- Rapid response — reviewers describe same-day and emergency visits
- Clear explanations — customers cite detailed communication
- Fair pricing — multiple reviews mention reasonable or fair costs
- Clean workmanship — reviewers mention tidy completed work

**Concerns:**
- License details — confirm the exact license information before booking
- Emergency coverage — ask about after-hours and 24/7 availability
- Quote terms — confirm whether the consultation is complimentary or fee-based
- Warranty scope — verify the one-year warranty terms for the project

## Claims & citations

Every claim below is backed by real evidence rows — uncited claims are dropped in code before publication.

- Google displays 82 ratings and the review history includes 72 reviews from 2023 through 2026. _(confidence: high)_
  - [Google](https://www.google.com/maps/search/?api=1&query=J.%20Kiesiner%20Mechanical%20LLC&query_place_id=ChIJEa3HF3cUco0R6nOkPlKNUDw) — “Google: 5★ from 82 ratings”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT25VMFptSXRaMFJJYUVReldXdHRaREZQTjJzeVMxRRAB!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CAIQACodChtycF9oOnU0ZmItZ0RIaEQzWWttZDFPN2syS1E%7C%7C?hl=en) — “5★ Keisner mechanical did a great job. Responded right away and got the job done. Clean and reliable work.”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSURENXAtOGV3EAE!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CIHM0ogKEICAgIDD5p-8ew%7C%7C?hl=en) — “5★ We're very happy to have had J Kiesiner Mechanical do the work replacing our 30+ year old boiler with an upgrade to a Bosch model. Mr. Ki…”
- Reviewers describe prompt response, clear explanations, clean work, and fair pricing. _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT25VMFptSXRaMFJJYUVReldXdHRaREZQTjJzeVMxRRAB!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CAIQACodChtycF9oOnU0ZmItZ0RIaEQzWWttZDFPN2syS1E%7C%7C?hl=en) — “5★ Keisner mechanical did a great job. Responded right away and got the job done. Clean and reliable work.”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT25KVlNGUlNhMlJpWTBWSU9VUXlZbnBHVjJSblIzYxAB!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CAIQACodChtycF9oOnJVSFRSa2RiY0VIOUQyYnpGV2RnR3c%7C%7C?hl=en) — “5★ Excellent response time and super professional job. fair pricing and super clean. The best!”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2swNVIyWmpaV0V0V2tSdE1WUkRNbEpWYnpBM0xYYxAB!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CAIQACodChtycF9oOk05R2ZjZWEtWkRtMVRDMlJVbzA3LXc%7C%7C?hl=en) — “5★ John was able to come by the house the same day I called and took care of a broken themostat at a very reasonable rate.  I would definite…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUM3NnZQMmV3EAE!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CIHM0ogKEICAgIC76vP2ew%7C%7C?hl=en) — “5★ Definitely deserves 5 stars. Would give more if available! John knows his trade inside and out! Feel very confident having John evaluate …”
- Reviews document plumbing, water-heater, boiler, furnace, air-conditioning, and mini-split work. _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2poa1owb3hibEpwZG05SVVVcG1SamhzU0Y5cWVHYxAB!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CAIQACodChtycF9oOjhkZ0oxblJpdm9IUUpmRjhsSF9qeGc%7C%7C?hl=en) — “5★ July 2026- John came back to fix our mini splits which we discovered were horribly installed by another company 2yrs ago (leaking refrige…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUMzOW9tVldnEAE!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CIHM0ogKEICAgIC39omVWg%7C%7C?hl=en) — “5★ Had to get my water heater replaced. Price was very reasonable, and they got to work the same day. Jon is a great guy, very honest and no…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUNudHVxaFVnEAE!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CIHM0ogKEICAgICntuqhUg%7C%7C?hl=en) — “5★ When Buderas boiler failed, John Kiesiner responded quickly to get heat and hot water functioning with new boiler system.  His thorough a…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUNEcXJmQkdnEAE!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CIHM0ogKEICAgICDqrfBGg%7C%7C?hl=en) — “5★ My experience with John was excellent! My furnace was on its last leg and stopped working. I called my guy who I normally use but he was …”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUR6LXRXM09BEAE!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CIHM0ogKEICAgIDz-tW3OA%7C%7C?hl=en) — “5★ My mini-split unit had no cooling at all due to poor parts used in the installation by the 'Endless Energy' company in Marlborough, MA. J…”
- Specializes in Plumbing _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2poa1owb3hibEpwZG05SVVVcG1SamhzU0Y5cWVHYxAB!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CAIQACodChtycF9oOjhkZ0oxblJpdm9IUUpmRjhsSF9qeGc%7C%7C?hl=en) — “5★ July 2026- John came back to fix our mini splits which we discovered were horribly installed by another company 2yrs ago (leaking refrige…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT25WU0xWZHBaMFJNTTIxZlpuTm1VR2swY0U4emFHYxAB!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CAIQACodChtycF9oOnVSLVdpZ0RMM21fZnNmUGk0cE8zaGc%7C%7C?hl=en) — “5★ I can’t say enough good things about Jon.  He repiped my basement plumbing, plumbing under the kitchen sink and shower and did an awesome…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUMxcWR2NjBBRRAB!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CIHM0ogKEICAgIC1qdv60AE%7C%7C?hl=en) — “5★ John is an excellent plumber with amazing customer service. John is very responsive and even fixes other contractors’ issues in order to …”
- Specializes in HVAC / Heating & Cooling _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT210WFNubEZWRmhoVnpGSE0zZHhiMjEwT1hNdFQyYxAB!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CAIQACodChtycF9oOmtXSnlFVFhhVzFHM3dxb210OXMtT2c%7C%7C?hl=en) — “5★ John is the most knowledable person I've ever met! 2 different companies came to take a look at my ac because it was not cooling, both sa…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUNudHVxaFVnEAE!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CIHM0ogKEICAgICntuqhUg%7C%7C?hl=en) — “5★ When Buderas boiler failed, John Kiesiner responded quickly to get heat and hot water functioning with new boiler system.  His thorough a…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUNEcXJmQkdnEAE!2m1!1s0x0:0x3c508d523ea473ea!3m1!1s2@1:CIHM0ogKEICAgICDqrfBGg%7C%7C?hl=en) — “5★ My experience with John was excellent! My furnace was on its last leg and stopped working. I called my guy who I normally use but he was …”

## License

Status: **not_found** — verified against the official MA state registry, never self-reported.
Re-check at the official registry: https://occupationallicensingandpermitting.mass.gov/madol/s/license-search-page

## Sources

- [Google](https://www.google.com/maps/search/?api=1&query=J.%20Kiesiner%20Mechanical%20LLC&query_place_id=ChIJEa3HF3cUco0R6nOkPlKNUDw): 5.0★ from 82 ratings
- [Google Reviews](https://www.google.com/maps/search/?api=1&query=J.%20Kiesiner%20Mechanical%20LLC&query_place_id=ChIJEa3HF3cUco0R6nOkPlKNUDw): Listed on this source
- [Official Website](https://jkiesinermechanical.com): 20 yrs in business · Self-reported profile and service details

## Recent reviews

- **5/5 · Google Reviews · fred economou · 2026-06-13**: Keisner mechanical did a great job. Responded right away and got the job done. Clean and reliable work.
- **5/5 · Google Reviews · Attila Alaksza · 2026-05-19**: John is the most knowledable person I've ever met! 2 different companies came to take a look at my ac because it was not cooling, both said it was working perfectly but obviously I won't call anyone if it works..John took his time to diagnose the problem and he fixed it right away! If you're looking…
- **5/5 · Google Reviews · Jannie Fowler · 2026-05-16**: I’m very satisfied with the installation of my A/C unit. He made sure everything was working properly before he left. Anyone thinking of doing any plumbing or heating/cooling he’s the best. Very thorough
- **5/5 · Google Reviews · Patricia Agostinho · 2026-04-28**: This was an emergency. He came and stayed until the job was finished. Very professional and his prices were very good.
- **5/5 · Google Reviews · MS · 2026-04-03**: Fantastic work - I'm very picky and Jon is an honest guy who responds very quickly and gets the job done. Explains everything to me and he cares about people and the quality of his work.  I use him for all my plumbing and HVAC needs - very knowledgeable, highly recommended!!!
- **5/5 · Google Reviews · Paula Skog · 2026-03-29**: Excellent response time and super professional job. fair pricing and super clean. The best!
- **5/5 · Google Reviews · Kerry Phelan-Li · 2026-01-25**: July 2026- John came back to fix our mini splits which we discovered were horribly installed by another company 2yrs ago (leaking refrigerant and oversized for the rooms). Once again he took the time to explain everything and was extremely thorough with the repairs to ensure we wouldn’t be having an…
- **5/5 · Google Reviews · Peter Waugh · 2026-01-19**: John is an expert plummer and HVAC  professional. He is utterly dependable and now, after the first couple engagements, I use him exclusively. His product knowledge is amazing, his service impeccable, and his pricing is well better  than fair.  I can not recommend J. Kiesiner Mechanical enough. You’…
- **5/5 · Google Reviews · Mark Ferro · 2025-10-31**: John was super responsive and very nice in getting our old furnace back up and running.  It’s hard to find a contractor that will

1. Answer the phone
2. Communicate with you when they are going to be there
3. Finish the job

John got us back up and running and was super nice and clean while doing i…
- **5/5 · Google Reviews · Jaclyn Belfiore · 2025-10-30**: John installed a new water heater in my home and was highly knowledgeable, efficient, friendly, and fairly priced. Would absolutely recommend John.

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Data freshness: last scanned 2026-08-24T10:37:02.871Z.
Cite as: J. Kiesiner Mechanical LLC — Tavlee (https://tavlee.com/contractor/j-kiesiner-mechanical-llc)
Source: https://tavlee.com/contractor/j-kiesiner-mechanical-llc