Herts: plumbing, heating and air-conditioning companies
Herts has 10 plumbing, heating and air-conditioning companies (SIC 43220) and 20 electrical and other installation companies registered here (Companies House, 1 Sep 2026); 0 are MCS-certified for air-to-air yet. If the office is in EN5, summer 2026 had ≈11 nights above 18 °C there (7 times the 1991–2020 average of 1.5).
SIC 43220
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A-TEC PLUMBING AND HEATING LIMITED, incorporated 2014, status Active.
Plumbing, heating and air-conditioning companies
| Company | Incorporated | Status | District |
|---|---|---|---|
| 800 LIMITED | 2004 | Active | EN6 |
| ALPHA AIR CONDITIONING UK LIMITED | 2004 | Active | AL8 |
| KNEBWORTH PLUMBING SOLUTIONS LTD | 2026 | Active | EN5 |
| PROPAX LIMITED | 2005 | Active | WD24 |
| A-TEC PLUMBING AND HEATING LIMITED | 2014 | Active | EN8 |
| STARLIGHT PLUMBING LIMITED | 2003 | Active | EN8 |
| SPOT ELECTRICAL LTD | 2021 | Active | EN11 |
| WILDEN SERVICES LIMITED | 1973 | Active | HP3 |
| LEWIS BATHROOMS LIMITED | 2024 | Active | HP3 |
| V & F GIDDINGS PROPERTY MAINTENANCE LIMITED | 2003 | Active | HP1 |
Electrical and other installation companies
| Company | SIC | Incorporated | Status | District |
|---|---|---|---|---|
| HAZ INTERNATIONAL LTD | 43290 · other construction installation; 43330; 46190 | 1990 | Active | AL9 |
| KAYBEC LTD | 43210 · electrical installation; 71200 | 2021 | Active | AL2 |
| CLC ELECTRICS LIMITED | 43210 · electrical installation | 2004 | Active | AL7 |
| APT ELECTRICAL LIMITED | 43210 · electrical installation | 2005 | Active | AL1 |
| E AND M GROUP LTD | 43210 · electrical installation | 2018 | Active | EN6 |
| TILES & BATHS DIRECT LIMITED | 43290 · other construction installation; 46740; 46760 | 2001 | Active | WD6 |
| TUONO TECH SERVICES LTD | 43210 · electrical installation; 43390; 71129 | 2022 | Active | EN5 |
| TRINITY PORTFOLIO LTD | 43290 · other construction installation | 2004 | Active | EN5 |
| PJC ELECTRICAL SERVICES SOUTH EAST LTD | 43210 · electrical installation | 2004 | Active | AL5 |
| SYSTEMATIC SERVICES LIMITED | 43210 · electrical installation | 2005 | Active | WD5 |
| PSA SOLUTIONS LIMITED | 43210 · electrical installation; 61200 | 2006 | Active | WD23 |
| OLIVER & COOKSEY LIMITED | 43290 · other construction installation | 1964 | Active | EN8 |
| LANGLEY ELECTRICAL CONTRACTORS LIMITED | 43210 · electrical installation | 2018 | Active | WD4 |
| SPARC ELECTRICAL LIMITED | 43210 · electrical installation | 2004 | Active | HP2 |
| CJP ELECTRICAL SOLUTIONS LTD | 43210 · electrical installation | 2018 | Active | HP2 |
| ESTUARY ELECTRICAL LIMITED | 43210 · electrical installation | 2003 | Active | WD3 |
| TOWER KITCHENS LIMITED | 43290 · other construction installation | 2016 | Active | SG11 |
| CONNECT ELECTRICAL CONTRACTORS (HERTFORDSHIRE) LIMITED | 43210 · electrical installation | 2007 | Active | SG11 |
| CONNECT NETWORK SOLUTIONS LIMITED | 43210 · electrical installation | 2007 | Active | CM23 |
| LJP ELECTRICAL LIMITED | 43210 · electrical installation | 2006 | Active | CM23 |
Heat and planning around Herts
In Herts last summer (2026) there were ≈10.7 nights that stayed above 18 °C — 7 times the 1991–2020 average of 1.5 (ERA5 reanalysis, grid ≈30 km, lower than street temperatures in cities). The figure is the household-weighted mean of 21 postcode districts where these offices are registered.
14% of sampled postcodes in Herts sit in a conservation area (16,507 live postcodes across 21 districts).
In England an air-source heat pump on a house can be permitted development under Class G when the conditions hold, including the MCS 020a noise limit of 37.0 dB(A) (§3.2 Step 8).
Companies House snapshot 1 Sep 2026, retrieved 25 Sep 2026. The address shown is the registered office, not a verified operating base. This catalogue is a directory of incorporated businesses, not an exhaustive installer register. Hot nights: ERA5-ARCO, June–August, minimum at or above 18 °C, household-weighted across the districts where these offices are registered, retrieved 25 Sep 2026. Conservation-area share: sampled postcode points, snapshot 25 Sep 2026. Distances are an equirectangular approximation to 0.1 km.
Better than a town directory that only lists names: each plumbing company links to its Companies House record and the local hot-night count.