--- title: "Landmark Air Systems, Inc." description: "Landmark Air Systems installs and replaces heating and air conditioning systems, boilers included, according to its own website, which also says the compan" doc_version: "2026-10-19" last_updated: "2026-10-19" --- # Landmark Air Systems, Inc. **Trade:** HVAC / Heating & Cooling · **Address:** 36-B Kenosia Ave, Danbury, CT 06810 · **Phone:** (203) 646-8278 · **Website:** https://www.landmarkairsystems.com/ · **Languages:** English **Rating: 2.9/5** (low confidence) — from 4 reviews across 5 sources. ## The honest read Landmark Air Systems installs and replaces heating and air conditioning systems, boilers included, according to its own website, which also says the company has been in business 51 years. Its Better Business Bureau profile describes HVAC installation, maintenance and repair, plus work on residential new construction projects, and the BBB gives it an A+ grade as an accredited business. A recent Google customer called the company on time, communicative and professional, and said they use it for their home and an investment property. A 2024 customer called it reliable and honest. A 2021 customer said the company installed heating and AC and made several mistakes on the boiler installation, listing missing check, drain and isolation valves, the wrong expansion tank and a pump in the wrong place. That 2021 customer said calls, emails and texts to the company went unanswered. A 2025 reviewer who did not hire the company directly wrote that it installed their HVAC system and that problems with the duct work left the system constantly shutting down in the winter from overheating. Connecticut lists an active D1 heating and cooling licence, HTG.0306629-D1, held by Landmark Air Systems. **Strengths:** - BBB A+ grade — accredited on its Better Business Bureau profile - On-time service — a recent customer called them on time and communicative **Concerns:** - Boiler install mistakes — a 2021 customer listed missing valves and a misplaced pump - Unreturned contact — a 2021 customer said calls, emails and texts went unanswered - Duct work problems — a 2025 reviewer said the system shut down from overheating ## Claims & citations Every claim below is backed by real evidence rows — uncited claims are dropped in code before publication. - Its website lists air conditioning and heating system installation and replacement, boiler installation and commercial HVAC. _(confidence: high)_ - [Official Website](https://www.landmarkairsystems.com) — “About (self-reported, verbatim): Services Air Conditioning Installation Air Conditioning Replacement Heating System Installation Heating Sys…” - The company says it has been in business 51 years. _(confidence: medium)_ - [Official Website](https://www.landmarkairsystems.com) — “Self-reported 51 years in business” - A+ grade and accredited on the Better Business Bureau. _(confidence: high)_ - [Better Business Bureau](https://www.bbb.org/us/ct/danbury/profile/heating-and-air-conditioning/landmark-air-systems-inc-0111-103782) — “Better Business Bureau grade: A+” - [Better Business Bureau](https://www.bbb.org/us/ct/danbury/profile/heating-and-air-conditioning/landmark-air-systems-inc-0111-103782) — “Better Business Bureau: accredited / certified / member” - A recent Google customer called the company on time, communicative and professional. _(confidence: medium)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2s5Q1VXOTNkbHBVTm1WcVZqZFpRalV0VTBGcWFFRRAB!2m1!1s0x0:0x8f481d585c7a084b!3m1!1s2@1:CAIQACodChtycF9oOk9CUW93dlpUNmVqVjdZQjUtU0FqaEE%7C%7C?hl=en-US) — “5★ On time. Communicative. Professional. Generous. Experts in their field. I use them for my home and my investment property; I will continu…” - A 2024 customer called the company reliable and honest. _(confidence: low)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUR2Z3JEN1lREAE!2m1!1s0x0:0x8f481d585c7a084b!3m1!1s2@1:CIHM0ogKEICAgIDvgrD7YQ%7C%7C?hl=en-US) — “5★ Reliable and honest. Highly recommend” - A 2021 customer described several mistakes on a boiler installation and said calls, emails and texts went unanswered. _(confidence: medium)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUNtc2RDOEpnEAE!2m1!1s0x0:0x8f481d585c7a084b!3m1!1s2@1:CIHM0ogKEICAgICmsdC8Jg%7C%7C?hl=en-US) — “1★ They installed heating and AC for me. They made several mistakes on the installation of the boiler. There were missing check valves, mi…” - A 2025 reviewer said duct work problems left an HVAC system the company installed shutting down in the winter from overheating. _(confidence: medium)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnTURBaHVxVm93RRAB!2m1!1s0x0:0x8f481d585c7a084b!3m1!1s2@1:CIHM0ogKEICAgMDAhuqVowE%7C%7C?hl=en-US) — “1★ We did not hire them but they installed our hvac system. We have had countless issues with their duct work, which led to our system const…” - 2.8 stars from 13 Google ratings. _(confidence: high)_ - [Google](https://www.google.com/maps/search/?api=1&query=Landmark%20Air%20Systems%2C%20Inc.&query_place_id=ChIJ2aj-uxNV3YkRSwh6XFgdSI8) — “Google: 2.8★ from 13 ratings” - Connecticut lists an active D1 heating and cooling licence, HTG.0306629-D1, held by Landmark Air Systems. _(confidence: high)_ - [State License Registry](https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx) — “CT hvac license HTG.0306629-D1 registry-verified active — registry holder of record: LANDMARK AIR SYSTEMS” - Specializes in HVAC / Heating & Cooling _(confidence: high)_ - [Better Business Bureau](https://www.bbb.org/us/ct/danbury/profile/heating-and-air-conditioning/landmark-air-systems-inc-0111-103782) — “About (Better Business Bureau, self-described): Landmark Air Systems provides HVAC installation, maintenance, and repair services, including…” - [Official Website](https://www.landmarkairsystems.com) — “About (self-reported, verbatim): Services Air Conditioning Installation Air Conditioning Replacement Heating System Installation Heating Sys…” ## License Status: **active** (#HTG.0306629-D1, 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=Landmark%20Air%20Systems%2C%20Inc.&query_place_id=ChIJ2aj-uxNV3YkRSwh6XFgdSI8): 2.8★ from 13 ratings - [Google Reviews](https://www.google.com/maps/search/?api=1&query=Landmark%20Air%20Systems%2C%20Inc.&query_place_id=ChIJ2aj-uxNV3YkRSwh6XFgdSI8): Listed on this source - [Better Business Bureau](https://www.bbb.org/us/ct/danbury/profile/heating-and-air-conditioning/landmark-air-systems-inc-0111-103782): Listed on this source - [Official Website](https://www.landmarkairsystems.com): 51 yrs in business · Self-reported profile and service details - [Local News](https://www.energizect.com/sites/default/files/2023-02/ECT%20HPIN%20Master%201-27-23.pdf): Listed on this source ## Recent reviews - **5/5 · Google Reviews · Mike Evans · 2026-07-26**: On time. Communicative. Professional. Generous. Experts in their field. I use them for my home and my investment property; I will continue to do so for years to come! - **1/5 · Google Reviews · Jennifer Glyphis · 2025-02-12**: We did not hire them but they installed our hvac system. We have had countless issues with their duct work, which led to our system constantly shutting down in the winter and rebooting three hours later due to overheating. Do not recommend. - **5/5 · Google Reviews · nicole van alstyne · 2024-12-18**: Reliable and honest. Highly recommend - **1/5 · Google Reviews · Travis Fairchild · 2021-12-31**: They installed heating and AC for me. They made several mistakes on the installation of the boiler. There were missing check valves, missing drain valves, missing isolation valves, installed the wrong expansion tank, they put the make-up water line in the wrong place, the pump was in the wrong pla… --- Data freshness: last scanned 2026-10-13T23:30:54.859Z. Cite as: Landmark Air Systems, Inc. — Tavlee (https://tavlee.com/contractor/landmark-air-systems-inc-danbury) Source: https://tavlee.com/contractor/landmark-air-systems-inc-danbury ## Sitemap [Full site index](https://tavlee.com/sitemap.md)