# CMSC Plumbing Heating and Air Conditioning

CMSC Plumbing Heating and Air Conditioning is a heating engineer in Chelmsford. Rated 4.9/5 from 2 public reviews across 1 review source. This is the MyTrustedTraders public-evidence profile — independent reviews, credentials and registry data from named public sources, with no ads and no paid placement.

Trust score: 46/100

## About
Central heating in Chelmsford, Essex.

## Public review evidence (by source)
| Source | Average rating | Reviews |
| --- | --- | --- |
| Checkatrade | 4.9/5 | 2 |

_Per-source review counts may overlap — they need not sum to the 2 cross-checked total above._

Rated 4.9★ — in line with the local average for heating engineers in Chelmsford. Across 26 heating engineers in Chelmsford, the typical rating is 4.9★. We compare against the same businesses a homeowner would find searching for this trade locally.

Most recent review: 2 years ago.

## In customers' own words
_Verbatim quotes from this trader's public reviews, each attributed to its source:_
> "Carlos has been doing repairs on my boiler and general plumbing work for over 10 years. Have always found him courteous and extremely efficient in all the work he has done for me. He is a good communicator and always goes the extra mile to sort out any problem. As I am a landlord and not on site when he carries out repair work, always sends me before and after photos."
> — Anonymous (5.0, via Checkatrade)

> "I have one Worcester and one Vaillant boiler and have employed CMSC over several years and have found Carlos Serna to be very reliable, knowledgeable, courteous and efficient. I have no hesitation in recommending him."
> — Anonymous (4.8, via Checkatrade)

## Trades
Heating engineer, Gas Engineer

## Services they list
_Listed on public sources or the business's own website; check directly that they cover your job before you book:_
- Central Heating

## Areas covered
_Towns and areas this trader lists serving (their own stated coverage — confirm they cover your exact address before you book):_
- Chelmsford
- Essex

## Independent verification
_What MyTrustedTraders independently checked for this business (verified items only):_
- Review volume: MTT is showing 2 public reviews on this profile. (via MyTrustedTraders public listing)
- Public listing spread: MTT is showing 1 public listing for this trader. (via MyTrustedTraders public listing)
- Business identity: MTT is showing public business identity data with operating status unknown. (via MyTrustedTraders public listing)

Full verification checklist: https://mytrustedtraders.com/traders/cmsc-plumbing-heating-and-air-conditioning/checks

## Credentials & sources
- Credentials shown: 0
- Companies House status: unknown
- Evidence held from: Checkatrade

## Before you hire a heating engineer
_What to check when choosing this kind of trade — general guidance, not a claim about this business:_
- Confirm they cover your area and can actually come out in your timeframe before anything else.
- Read recent reviews for reliability and turning up on time — not only the quality of the work.
- Agree the call-out fee up front, and be wary of large upfront deposits for an emergency job.
- Run the Cowboy Checker to confirm the business is real before you let anyone in.

---
Source: MyTrustedTraders — https://mytrustedtraders.com/traders/cmsc-plumbing-heating-and-air-conditioning
Real public evidence only: every figure traces to a named source and is cross-checked. If a source does not carry a field, it is not shown.