--- title: "Millas Heating & Cooling LLC" description: "Millas Heating & Cooling describes itself as a family-owned company, in business since 2016, that installs and services residential heating and cooling equ" doc_version: "2026-10-31" last_updated: "2026-10-31" --- # Millas Heating & Cooling LLC **Trade:** HVAC / Heating & Cooling · **Address:** 800 Flanders Rd Building #12, Mystic, CT 06355 · **Phone:** (860) 415-9962 · **Website:** http://www.millashc.com/ · **Languages:** English **Rating: 4.4/5** (high confidence) — from 25 reviews across 5 sources. 96% of sentiment-scored reviews read net-positive. Last 6 months: 0 reviews, 0 negative. ## The honest read Millas Heating & Cooling describes itself as a family-owned company, in business since 2016, that installs and services residential heating and cooling equipment. Its Connecticut heating licence, HTG.0405813-S9, held by MILLAS HEATING & COOLING LLC, is active on the state registry. Google shows 4.9 stars from 49 ratings, and its BBB page is an A+. A 2026 customer said Jay gave a quote and explained options, the installers put down tarps, and Jay completed the Groton Utilities paperwork. In 2025, a customer said Millas installed a complete heat pump mini-split system and a new Roth oil tank. A 2024 customer said the company installed a ducted heat pump system in a house with no existing ductwork. A 2026 customer had a combo gas boiler and water heater installed. In 2025, a customer said Jay and his guys installed a Pure Pro Trio boiler, a Heat Flo indirect water heater and a new oil tank, then walked through the operation. A 2025 customer named Julia said Jay planned a propane boiler system, removed the oil tank and old boiler, and obtained the permits. In 2023, a customer said Jay called on the first cold day of fall to report a flaw he had found in their system and came that day to fix it. A 2022 customer said their calls were never returned. **Strengths:** - Utility paperwork help — a 2026 customer said Jay completed the Groton Utilities form - A flaw found later — a 2023 customer said Jay called and fixed it that day - A ducted heat pump — a 2024 customer's house had no existing ductwork **Concerns:** - Unreturned calls — a 2022 customer said calls were never returned ## Claims & citations Every claim below is backed by real evidence rows — uncited claims are dropped in code before publication. - Connecticut heating licence HTG.0405813-S9, held by MILLAS HEATING & COOLING LLC, is active on the state registry _(confidence: high)_ - [State License Registry](https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx) — “CT hvac license HTG.0405813-S9 registry-verified active — registry holder of record: MILLAS HEATING & COOLING LLC” - Google shows 4.9 stars from 49 ratings _(confidence: high)_ - [Google](https://www.google.com/maps/search/?api=1&query=Millas%20Heating%20%26%20Cooling%20LLC&query_place_id=ChIJr_SUPQMK5okRnb4TndRZOI0) — “Google: 4.9★ from 49 ratings” - BBB grade A+ _(confidence: high)_ - [Better Business Bureau](https://www.bbb.org/us/ct/mystic/profile/heating-and-air-conditioning/millas-heating-cooling-llc-0111-87125514) — “Better Business Bureau grade: A+” - The company describes itself as family owned and operated since 2016 _(confidence: medium)_ - [Official Website](http://www.millashc.com) — “About (self-reported, verbatim): Proudly family owned and operated since 2016​​​​​​​​​​, we are your local HVAC experts to provide installat…” - A 2025 customer described a complete heat pump mini-split system and Roth oil tank install _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2pSTFRtRnBWMnM1UVhOU1VXWkNjVVpxZFdSU01YYxAB!2m1!1s0x0:0x8d3859d49d13be9d!3m1!1s2@1:CAIQACodChtycF9oOjRLTmFpV2s5QXNSUWZCcUZqdWRSMXc%7C%7C?hl=en-US) — “5★ We can't say enough good things about this company. In this environment when many companies don't return calls Jay and his team where gre…” - A 2024 customer described a ducted heat pump system installed in a house with no ductwork _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUMzenFtZExBEAE!2m1!1s0x0:0x8d3859d49d13be9d!3m1!1s2@1:CIHM0ogKEICAgIC3zqmdLA%7C%7C?hl=en-US) — “5★ We hired Millas to install a ducted heat pump system in our house which did not have existing ductwork. The crew did a great job with the…” - A 2025 customer described a Pure Pro Trio boiler and indirect water heater install _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnTUN3Xzd5VS13RRAB!2m1!1s0x0:0x8d3859d49d13be9d!3m1!1s2@1:CIHM0ogKEICAgMCw_7yU-wE%7C%7C?hl=en-US) — “5★ After 26 years my furnace and oil tank needed replacement. Jay and his guys installed a Pure Pro Trio boiler/ Heat Flo indirect water hea…” - A 2023 customer said Jay called about a flaw he found and fixed it that day _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUNGNzVHN2lBRRAB!2m1!1s0x0:0x8d3859d49d13be9d!3m1!1s2@1:CIHM0ogKEICAgICF75G7iAE%7C%7C?hl=en-US) — “5★ Millas was one of 4 companies we got quotes from summer 23 for AC install. He was the most direct about what would work best for our home…” - A 2022 customer said calls were never returned _(confidence: medium)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUNCem9lSmVnEAE!2m1!1s0x0:0x8d3859d49d13be9d!3m1!1s2@1:CIHM0ogKEICAgICBzoeJeg%7C%7C?hl=en-US) — “1★ They never returned my calls” - Specializes in HVAC / Heating & Cooling _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2xJMmFIWndVVWczTmsxRVVrVk5iVkozU214VE0yYxAB!2m1!1s0x0:0x8d3859d49d13be9d!3m1!1s2@1:CAIQACodChtycF9oOlI2aHZwUUg3Nk1EUkVNbVJ3SmxTM2c%7C%7C?hl=en-US) — “5★ Jay and his crew were awesome throughout the entire process of installing my new combo gas boiler and water heater. Their work was quick,…” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2pSTFRtRnBWMnM1UVhOU1VXWkNjVVpxZFdSU01YYxAB!2m1!1s0x0:0x8d3859d49d13be9d!3m1!1s2@1:CAIQACodChtycF9oOjRLTmFpV2s5QXNSUWZCcUZqdWRSMXc%7C%7C?hl=en-US) — “5★ We can't say enough good things about this company. In this environment when many companies don't return calls Jay and his team where gre…” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnTUN3Xzd5VS13RRAB!2m1!1s0x0:0x8d3859d49d13be9d!3m1!1s2@1:CIHM0ogKEICAgMCw_7yU-wE%7C%7C?hl=en-US) — “5★ After 26 years my furnace and oil tank needed replacement. Jay and his guys installed a Pure Pro Trio boiler/ Heat Flo indirect water hea…” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUMzenFtZExBEAE!2m1!1s0x0:0x8d3859d49d13be9d!3m1!1s2@1:CIHM0ogKEICAgIC3zqmdLA%7C%7C?hl=en-US) — “5★ We hired Millas to install a ducted heat pump system in our house which did not have existing ductwork. The crew did a great job with the…” ## Ownership - Identifies as family-owned — the business's own statement, not independently verified. ## License Status: **active** (#HTG.0405813-S9, hvac) — verified against the official CT state registry on 2026-10-30, never self-reported. Re-check at the official registry: https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx ## Sources - [Official Website](http://www.millashc.com): 10 yrs in business · Self-reported profile and service details - [Google](https://www.google.com/maps/search/?api=1&query=Millas%20Heating%20%26%20Cooling%20LLC&query_place_id=ChIJr_SUPQMK5okRnb4TndRZOI0): 4.9★ from 49 ratings - [Google Reviews](https://www.google.com/maps/search/?api=1&query=Millas%20Heating%20%26%20Cooling%20LLC&query_place_id=ChIJr_SUPQMK5okRnb4TndRZOI0): Listed on this source - [Better Business Bureau](https://www.bbb.org/us/ct/mystic/profile/heating-and-air-conditioning/millas-heating-cooling-llc-0111-87125514): Listed on this source - [BuildZoom](https://www.buildzoom.com/contractor/jason-millas): Listed on this source ## Recent reviews - **5/5 · Google Reviews · n Robinson · 2026-04-24**: A super great company to work with! From the time Jay spent giving me a quote and explaining all my options to the installation this was nothing but a professional company to work with. I was never left in the dark as that my questions were always answered in a timely manner. The installers were qui… - **5/5 · Google Reviews · Marc Labrosse · 2026-01-16**: Jay and his crew were awesome throughout the entire process of installing my new combo gas boiler and water heater. Their work was quick, clean and efficient. The communication throughout the process was excellent. My family is extremely happy with the outcome of this project. If you want quality wo… - **5/5 · Google Reviews · Nicholas Frassenei · 2025-11-06**: Jay and his crew were very professional for a fair price on my mini-split installation. Installation of both the indoor and outdoor units looks great, they cleaned up well after themselves, and were very responsive throughout. Highly recommend. - **5/5 · Google Reviews · jeff d · 2025-10-13**: We can't say enough good things about this company. In this environment when many companies don't return calls Jay and his team where great from the first phone call until his team finished the job. They installed a complete new heat pump Mini Split system for AC / Heat and a new Roth oil tank, all… - **5/5 · Google Reviews · Stephen B · 2025-08-01**: From beginning to end Millas was responsive, efficient, and friendly!! They called the first Monday after I emailed them asking for a quote. They showed up on-time, gave some great advice, and gave me a quote that was under what I expected. The team they sent to install the mini split system were… - **5/5 · Google Reviews · John Weaver · 2025-03-22**: After 26 years my furnace and oil tank needed replacement. Jay and his guys installed a Pure Pro Trio boiler/ Heat Flo indirect water heater and new oil tank. It’s so much quieter than my previous setup. They explained how everything works and walked thru the operation with me. These guys do quality… - **5/5 · Google Reviews · syntheticcinema · 2025-02-15**: Jason Millas and his team were outstanding—professional, friendly, and reliable. They delivered on time and within budget, exceeding my expectations. Jason has been maintaining our HVAC system since 2018, and when it was time for a full replacement, his expertise and service made the process seamles… - **5/5 · Google Reviews · Julia Shibley · 2025-01-04**: Hello, my name is Julia and I was looking at replacing my old oil heating system. Because both the oil tank and oil boiler needed to be replaced, I decided to explore the most efficient and greener options. I discovered a propane system would be best. It is 95% efficient vs 85% efficiency of the mos… - **5/5 · Google Reviews · Megan Lagasse · 2024-12-15**: Millas was recommended to me by r.b. Kent & son and I’m glad they did. Scheduling was easy and the guys were nice and professional. Would definitely recommend them :) - **5/5 · Google Reviews · John Goodyear · 2024-11-05**: We hired Millas to install a ducted heat pump system in our house which did not have existing ductwork. The crew did a great job with the install. Jay was easy to communicate with and answered all of our questions during the process. We would highly recommend Millas! --- Data freshness: last scanned 2026-10-30T14:41:18.049Z. Cite as: Millas Heating & Cooling LLC — Tavlee (https://tavlee.com/contractor/millas-heating-and-cooling-llc-mystic) Source: https://tavlee.com/contractor/millas-heating-and-cooling-llc-mystic ## Sitemap [Full site index](https://tavlee.com/sitemap.md)