---
title: "Jeff Mackay Mechanical LLC"
description: "Jeff Mackay Mechanical is a heating and cooling business that says it has been in business for 30 years, with a service area its website runs from Littleto"
doc_version: "2026-10-31"
last_updated: "2026-10-31"
---

# Jeff Mackay Mechanical LLC

**Trade:** HVAC / Heating & Cooling · **Address:** 185 School Street, Littleton, NH 03561 · **Phone:** (603) 616-9664 · **Website:** https://jeffmackaymechanical.com/ · **Languages:** English

**Rating: 4.2/5** (high confidence) — from 36 reviews across 6 sources.
97% of sentiment-scored reviews read net-positive. Last 6 months: 2 reviews, 0 negative.

## The honest read

Jeff Mackay Mechanical is a heating and cooling business that says it has been in business for 30 years, with a service area its website runs from Littleton and Franconia out to Berlin and Colebrook. Jeffrey S Mackay's New Hampshire HVAC licence, number GF0700553, is active on the state registry. On Google the business holds 4.9 stars from 36 ratings.

A recent customer said Jeff and his assistant John installed a new furnace, answered their questions and cleaned up any mess along the way. A recent customer said Jeff and John installed a/c mini splits and kept them informed from the walk-through estimate to the final installation.

A 2025 customer said the company converted their home from oil to propane, with all new copper piping, circulators, switches and equipment. In a 2025 review, a customer said Jeff fixed their furnace in about an hour and checked the gas-to-oxygen ratio with the proper tools. A 2024 customer said that when their boiler stopped working during one of the coldest weeks, Jeff determined the size they needed and a new one was installed the next day. A 2024 customer said they had used Jeff for their furnace needs for over 25 years.

In a 2026 Google review, a customer complained of no-shows and said he did not call to reschedule.

**Strengths:**
- Oil-to-propane conversion — a 2025 customer described all new piping and equipment
- Next-day boiler install — a 2024 customer said it went in the next day
- A mini-split install — a recent customer said they were kept informed throughout

**Concerns:**
- Missed appointments — a 2026 reviewer said he no-showed without calling

## Claims & citations

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

- Says it has been in business for 30 years _(confidence: medium)_
  - [Official Website](https://jeffmackaymechanical.com) — “Self-reported 30 years in business”
- Lists a service area from Littleton and Franconia to Berlin and Colebrook _(confidence: medium)_
  - [Official Website](https://jeffmackaymechanical.com) — “Stated service area (self-reported): Littleton, Franconia, Lincoln, Plymouth, Hanover, Grafton, Whitefield, Lisbon, Ashland, Bath, Berlin, B…”
- Jeffrey S Mackay's New Hampshire HVAC licence GF0700553 is active on the state registry _(confidence: high)_
  - [State License Registry](https://forms.nh.gov/licenseverification/) — “NH hvac license GF0700553 registry-verified active — registry holder of record: Jeffrey S Mackay”
- 4.9 stars on Google from 36 ratings _(confidence: high)_
  - [Google](https://www.google.com/maps/search/?api=1&query=Jeff%20MacKay%20Mechanical&query_place_id=ChIJX6aO5O9A-0IRrZrcWUDamLc) — “Google: 4.9★ from 36 ratings”
- A recent customer said Jeff and his assistant John installed a new furnace and cleaned up _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21ReWRVaDZXbVk0VUhONmFqTnhjMWwxUnpKTWJVRRAB!2m1!1s0x0:0xb798da4059dc9aad!3m1!1s2@1:CAIQACodChtycF9oOmQydUh6WmY4UHN6ajNxc1l1RzJMbUE%7C%7C?hl=en-US) — “5★ Jeff and his assistant John were very polite and professional in the installation of my new furnace. They answered all my questions and c…”
- A 2025 customer described an oil-to-propane conversion with all new copper piping and equipment _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21scmJrUmFUMXBMUmpkWFZXZEdZMFJoVkhacldrRRAB!2m1!1s0x0:0xb798da4059dc9aad!3m1!1s2@1:CAIQACodChtycF9oOmlrbkRaT1pLRjdXVWdGY0RhVHZrWkE%7C%7C?hl=en-US) — “5★ Jeff MacKay Mechanical completely transformed our home’s heating and plumbing system, and we are beyond impressed. We converted from oil …”
- A 2024 customer said a new boiler was installed the day after it was ordered during a cold week _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUNIc2Vyc29RRRAB!2m1!1s0x0:0xb798da4059dc9aad!3m1!1s2@1:CIHM0ogKEICAgICHsersoQE%7C%7C?hl=en-US) — “5★ When our boiler stopped working during one of the coldest weeks last winter, my propane company recommended Jeff MacKay Mechanical and I'…”
- A 2026 Google reviewer complained of no-shows without a call to reschedule _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT25wS2VsUk9VVlUyTkZsb1lVcDJSMWhpTUhOTE9HYxAB!2m1!1s0x0:0xb798da4059dc9aad!3m1!1s2@1:CAIQACodChtycF9oOnpKelROUVU2NFloYUp2R1hiMHNLOGc%7C%7C?hl=en-US) — “1★ no shows, doesn't call or communicate, doesn't call to reschedule when he no shows. Not reliable.”
- Specializes in HVAC / Heating & Cooling _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21ReWRVaDZXbVk0VUhONmFqTnhjMWwxUnpKTWJVRRAB!2m1!1s0x0:0xb798da4059dc9aad!3m1!1s2@1:CAIQACodChtycF9oOmQydUh6WmY4UHN6ajNxc1l1RzJMbUE%7C%7C?hl=en-US) — “5★ Jeff and his assistant John were very polite and professional in the installation of my new furnace. They answered all my questions and c…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2tsaU1qSTJhSEowUm1WTlpYcEhSRWd6T1VoUmJuYxAB!2m1!1s0x0:0xb798da4059dc9aad!3m1!1s2@1:CAIQACodChtycF9oOkliMjI2aHJ0RmVNZXpHREgzOUhRbnc%7C%7C?hl=en-US) — “5★ Jeff and John did a great job installing our a/c mini splits. From the initial walk thru to provide the estimate through final installati…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2xKNVFtVkxhVlZKZHpSR1pHNUdhVVJPYm0xNVVVRRAB!2m1!1s0x0:0xb798da4059dc9aad!3m1!1s2@1:CAIQACodChtycF9oOlJ5QmVLaVVJdzRGZG5GaURObm15UUE%7C%7C?hl=en-US) — “5★ Jeff Mackay Mechanical is fantastic! Jeff fixed my furnace in about an hour and took the time to explain everything clearly so I felt con…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUNIc2Vyc29RRRAB!2m1!1s0x0:0xb798da4059dc9aad!3m1!1s2@1:CIHM0ogKEICAgICHsersoQE%7C%7C?hl=en-US) — “5★ When our boiler stopped working during one of the coldest weeks last winter, my propane company recommended Jeff MacKay Mechanical and I'…”
  - [State License Registry](https://forms.nh.gov/licenseverification/) — “NH hvac license GF0700553 registry-verified active — registry holder of record: Jeffrey S Mackay”
- Also offers Plumbing _(confidence: low)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21scmJrUmFUMXBMUmpkWFZXZEdZMFJoVkhacldrRRAB!2m1!1s0x0:0xb798da4059dc9aad!3m1!1s2@1:CAIQACodChtycF9oOmlrbkRaT1pLRjdXVWdGY0RhVHZrWkE%7C%7C?hl=en-US) — “5★ Jeff MacKay Mechanical completely transformed our home’s heating and plumbing system, and we are beyond impressed. We converted from oil …”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUQ3bXVDRWFBEAE!2m1!1s0x0:0xb798da4059dc9aad!3m1!1s2@1:CIHM0ogKEICAgID7muCEaA%7C%7C?hl=en-US) — “5★ jeff put in a new dish washer for me did a great job found a leak in a another pipe and fixed it would tell anyone to use jeff”

## License

Status: **active** (#GF0700553, hvac) — verified against the official NH state registry on 2026-10-30, never self-reported.
Re-check at the official registry: https://forms.nh.gov/licenseverification/

## Sources

- [Exa](https://jeffmackaymechanical.com/): 0 web mentions across the open web (each linked to its source)
- [Google](https://www.google.com/maps/search/?api=1&query=Jeff%20Mackay%20Mechanical%20LLC&query_place_id=ChIJX6aO5O9A-0IRrZrcWUDamLc): 4.9★ from 36 ratings
- [Official Website](https://jeffmackaymechanical.com): 30 yrs in business · Self-reported profile and service details
- [Google Reviews](https://www.google.com/maps/search/?api=1&query=Jeff%20Mackay%20Mechanical%20LLC&query_place_id=ChIJX6aO5O9A-0IRrZrcWUDamLc): Listed on this source
- [Angi](https://www.angi.com/companylist/us/nh/littleton/jeff-mackay-mechanical-llc-reviews-1.htm): 5.0★ from 6 ratings
- [Local News](https://603tradebook.com/gas-fitting/littleton-nh/): Listed on this source

## Recent reviews

- **5/5 · Google Reviews · Franklin Haines · 2026-06-15**: Jeff and his assistant John were very polite and professional in the installation of my new furnace. They answered all my questions and cleaned up any mess that occurred during the installation process. I highly recommend  Jeff and his company for any HVAC you need to have done.
- **5/5 · Google Reviews · Ann Christoffersen · 2026-05-25**: Jeff and John did a great job installing our a/c mini splits. From the initial walk thru to provide the estimate through final installation they kept us informed of the whole process, answered all of our questions and kept the disruptions to a minimum. Very friendly, competent, and accommodating.
- **5/5 · Google Reviews · kds · 2026-04-19**: I have had Jeff MacKay to my home in order to figure out a couple of different problems. He is very professional and clearly explains why there is a problem and how it could be fixed ...or not.
One issue I had was a whole house AC unit that would work wonderfully until it stopped being great. Jeff c…
- **5/5 · Google Reviews · Chris Trudell · 2026-02-16**: Thank you for your excellent work! See you soon!
- **5/5 · Google Reviews · Dillon Whiting · 2026-02-06**: Jeff was communicative, to the point and got the job done quickly at a fair price.
- **5/5 · Google Reviews · Paul Maresca · 2026-01-25**: Quick response.  Very friendly. Address my mini-split issue. Would highly recommend.
- **1/5 · Google Reviews · Cannon Girl · 2026-01-23**: no shows, doesn't call or communicate, doesn't call to reschedule when he no shows. Not reliable.
- **5/5 · Google Reviews · Jennifer Hirsch · 2026-01-06**: Jeff did a great job!  He took the time to research and figure out our unique situation and came up with a solution for us. So very thankful he could take care of us during this extremely busy season of his.
- **5/5 · Google Reviews · Robert Meserve · 2026-01-03**: Fair job. Had to get additional parts as usual  Furnace is working fine now
- **5/5 · Google Reviews · Stephen Dignazio · 2025-12-08**: Knowledgeable, efficient, and responsive.

---

Data freshness: last scanned 2026-10-30T22:35:23.363Z.
Cite as: Jeff Mackay Mechanical LLC — Tavlee (https://tavlee.com/contractor/jeff-mackay-mechanical-llc-littleton)
Source: https://tavlee.com/contractor/jeff-mackay-mechanical-llc-littleton

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