--- title: "Reliable Heating & Air Conditioning Co" description: "Reliable Heating & Air Conditioning Co is an HVAC company that says it has served the CT Shoreline and Middlesex, New Haven and New London counties since 1" doc_version: "2026-10-19" last_updated: "2026-10-19" --- # Reliable Heating & Air Conditioning Co **Trade:** HVAC / Heating & Cooling · **Address:** 200 Green Hill Rd, Killingworth, CT 06419 · **Phone:** (860) 663-6000 · **Website:** http://www.reliableheatac.com/ · **Languages:** English **Rating: 3.6/5** (medium confidence) — from 8 reviews across 4 sources. 88% of sentiment-scored reviews read net-positive. Last 6 months: 2 reviews, 1 negative. ## The honest read Reliable Heating & Air Conditioning Co is an HVAC company that says it has served the CT Shoreline and Middlesex, New Haven and New London counties since 1989. Its stated service area includes Killingworth. A recent customer said their AC went out during the hottest days, the call was handled quickly and the repair was reasonable. A 2025 customer said Bill spent two hours on a furnace that 5-6 other technicians could not diagnose, gave it a fine tuning and changed out a part or two, and said it had worked since. A 2025 reviewer wrote that after another company said the whole AC system needed replacing, Bill came out the same day and fixed everything in 3 hours. In a 2025 review, a customer said Bill found capacitor leads at the breaking point and a low freon level on their AC system and fixed both. A 2023 customer said Bill recommended equipment that qualified for Eversource rebates, then installed a new heat pump system and air handler integrated with their existing hydro air system. A recent customer complained of slow response to service calls and said two different companies found faulty wiring and coolant problems days later on a new AC he installed. It holds an active Connecticut S1 heating and cooling contractor licence, HTG.0303729-S1, under William J Mazziotti. **Strengths:** - Same-day AC repair — a 2025 customer said Bill fixed everything in 3 hours - Hard furnace problem — a 2025 customer said Bill tuned it after others failed - A quick AC call — a recent customer said the call was handled quickly **Concerns:** - Service-call response — a recent customer said response took days to never - A new AC install — a recent customer said others later found faulty wiring ## Claims & citations Every claim below is backed by real evidence rows — uncited claims are dropped in code before publication. - Says it has served the CT Shoreline and Middlesex, New Haven and New London counties since 1989 _(confidence: medium)_ - [Official Website](http://www.reliableheatac.com) — “About (self-reported, verbatim): Reliable Heating & A/C Co. is a locally owned and operated HVAC company, serving the CT Shoreline and Middl…” - A recent customer said an AC outage call was handled quickly and the repair was reasonable _(confidence: medium)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT20wemJFVklUM2xqZWtzMlExbFBWM1IzYUd0RGJsRRAB!2m1!1s0x0:0xb24456639160d21e!3m1!1s2@1:CAIQACodChtycF9oOm0zbEVIT3ljeks2Q1lPV3R3aGtDblE%7C%7C?hl=en-US) — “5★ Just great service! My AC went out during the hottest days and my call was handled quickly, repair was reasonable, and my AC now works p…” - A 2025 customer said Bill tuned a furnace other technicians could not diagnose _(confidence: medium)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2tkWE5HbERlRkUxWkUxdFpIbE1SMUowU1dwaFMzYxAB!2m1!1s0x0:0xb24456639160d21e!3m1!1s2@1:CAIQACodChtycF9oOkdXNGlDeFE1ZE1tZHlMR1J0SWphS3c%7C%7C?hl=en-US) — “5★ We had a problem with our furnace for years that no service technician could diagnose. We had about 5-6 different technicians come servi…” - A 2025 customer said Bill came the same day and fixed an AC system in 3 hours _(confidence: medium)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT25waVZsSmhjRGgwWTNVNU5XRnBhR3d5T1ZWSVJWRRAB!2m1!1s0x0:0xb24456639160d21e!3m1!1s2@1:CAIQACodChtycF9oOnpiVlJhcDh0Y3U5NWFpaGwyOVVIRVE%7C%7C?hl=en-US) — “5★ Bill is THE MAN! Had another company tell me my AC system was toast and that I needed to replace the whole thing, but then they weren't g…” - A 2023 customer said Bill installed a new heat pump system and air handler _(confidence: medium)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUM1M2NMUlJBEAE!2m1!1s0x0:0xb24456639160d21e!3m1!1s2@1:CIHM0ogKEICAgIC53cLRRA%7C%7C?hl=en-US) — “5★ We needed to replace our air conditioner unit and wanted to take advantage of the substantial rebates available from Eversource. Bill a…” - A recent customer complained of slow service-call response and said other companies found faulty wiring and coolant problems on a new AC _(confidence: medium)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21OeU5tbE1Relp5ZVZRNVpEVTVUMGhQYkVaMWFsRRAB!2m1!1s0x0:0xb24456639160d21e!3m1!1s2@1:CAIQACodChtycF9oOmNyNmlMQzZyeVQ5ZDU5T0hPbEZ1alE%7C%7C?hl=en-US) — “1★ Terrible response to service calls days to never. Lies like a blanket. Installed new AC two different companies found faulty wiring and c…” - It holds an active Connecticut S1 heating and cooling contractor licence, HTG.0303729-S1, under William J Mazziotti. _(confidence: high)_ - [State License Registry](https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx) — “CT hvac license HTG.0303729-S1 registry-verified active — registry holder of record: WILLIAM J MAZZIOTTI” - Specializes in HVAC / Heating & Cooling _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2tkWE5HbERlRkUxWkUxdFpIbE1SMUowU1dwaFMzYxAB!2m1!1s0x0:0xb24456639160d21e!3m1!1s2@1:CAIQACodChtycF9oOkdXNGlDeFE1ZE1tZHlMR1J0SWphS3c%7C%7C?hl=en-US) — “5★ We had a problem with our furnace for years that no service technician could diagnose. We had about 5-6 different technicians come servi…” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT25waVZsSmhjRGgwWTNVNU5XRnBhR3d5T1ZWSVJWRRAB!2m1!1s0x0:0xb24456639160d21e!3m1!1s2@1:CAIQACodChtycF9oOnpiVlJhcDh0Y3U5NWFpaGwyOVVIRVE%7C%7C?hl=en-US) — “5★ Bill is THE MAN! Had another company tell me my AC system was toast and that I needed to replace the whole thing, but then they weren't g…” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUM1M2NMUlJBEAE!2m1!1s0x0:0xb24456639160d21e!3m1!1s2@1:CIHM0ogKEICAgIC53cLRRA%7C%7C?hl=en-US) — “5★ We needed to replace our air conditioner unit and wanted to take advantage of the substantial rebates available from Eversource. Bill a…” - [Official Website](http://www.reliableheatac.com) — “About (self-reported, verbatim): Reliable Heating & A/C Co. is a locally owned and operated HVAC company, serving the CT Shoreline and Middl…” ## License Status: **active** (#HTG.0303729-S1, hvac) — verified against the official CT state registry on 2026-10-19, never self-reported. Re-check at the official registry: https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx ## Sources - [Google](https://www.google.com/maps/search/?api=1&query=Reliable%20Heating%20%26%20Air%20Conditioning%20Co&query_place_id=ChIJ3WFnHFku5okRHtJgkWNWRLI): 4.7★ from 15 ratings - [Google Reviews](https://www.google.com/maps/search/?api=1&query=Reliable%20Heating%20%26%20Air%20Conditioning%20Co&query_place_id=ChIJ3WFnHFku5okRHtJgkWNWRLI): Listed on this source - [Official Website](http://www.reliableheatac.com): 37 yrs in business · Self-reported profile and service details - [Local News](https://www.tradecheckusa.com/verify/reliable-heating-and-air-conditioning-co-killingworth): Listed on this source ## Recent reviews - **5/5 · Google Reviews · Grace Greco · 2026-06-29**: Just great service! My AC went out during the hottest days and my call was handled quickly, repair was reasonable, and my AC now works perfectly! Thank you very much!! (You're now on speed dial🤣) - **1/5 · Google Reviews · Todd Applegate · 2026-05-18**: Terrible response to service calls days to never. Lies like a blanket. Installed new AC two different companies found faulty wiring and coolant problems days later after him basically refusing to service - **5/5 · Google Reviews · Christopher Courtright · 2025-12-12**: Bill was great to work with. Extremely professional and responsive to my urgent needs. I would highly recommend this business and will continue to use his services. Good communicator and very reasonable pricing. - **5/5 · Google Reviews · Craig DeLeone · 2025-12-02**: We had a problem with our furnace for years that no service technician could diagnose. We had about 5-6 different technicians come service our furnace and each time, they walked away dumbfounded. Bill was here for two hours and gave it a fine tuning, changed out a part or two, and since then...it … - **5/5 · Google Reviews · Lea Coppola · 2025-06-25**: Bill is truly the best in the business. Professional, thorough, and extremely knowledgeable . He explains in detail what the problem is and the solution for repair. We wouldn’t call anyone else but Reliable Heating & Air Conditioning Co. Second to none! - **5/5 · Google Reviews · Jeff Rose · 2025-06-18**: Bill is THE MAN! Had another company tell me my AC system was toast and that I needed to replace the whole thing, but then they weren't getting back to me about quotes and timing. Something felt off and I wanted a second opinion so I called Bill. He came out the same day fixed everything in 3 hours … - **5/5 · Google Reviews · J G · 2025-04-28**: Bill came highly recommended by a few neighbors. Today he came for the first time to service our AC system. He was prompt, friendly, very knowledgeable. Found capacitor leads that were at the breaking point, low freon level, fixed both. Also well acquainted with our humidifier and dehumidifier s… - **5/5 · Google Reviews · Skip Vincelett · 2023-10-16**: We needed to replace our air conditioner unit and wanted to take advantage of the substantial rebates available from Eversource. Bill advised on the technology and recommended the correct equipment to qualify for the rebates. He installed a new heat pump system and air handler and integrated it wi… --- Data freshness: last scanned 2026-10-14T10:19:32.007Z. Cite as: Reliable Heating & Air Conditioning Co — Tavlee (https://tavlee.com/contractor/reliable-heating-and-air-conditioning-co-killingworth) Source: https://tavlee.com/contractor/reliable-heating-and-air-conditioning-co-killingworth ## Sitemap [Full site index](https://tavlee.com/sitemap.md)