Heat Halo delivers professionally installed internal wall insulation for solid-wall properties where conventional retrofit solutions are too disruptive, impractical, or unsuitable for the building fabric. Our approach combines independent testing, controlled installation standards, and evidence-led retrofit thinking.
External cladding is often refused on heritage properties. Insulation boards can cost 3–11 m² of floor space across a typical home and retail thermal paints rarely deliver.
Heat Halo exists for the homes the retrofit market has left behind.
Not a retail product — a professionally delivered insulation coating with a documented evidence base.
What is Heat Halo?
Heat Halo is a spray-applied coating installed to internal solid walls by trained specialist contractors. The system is built up in controlled layers, then finished with a sprayed plaster skim and emulsion — leaving the wall looking like any other finished interior.
It is not a retail product. It is not sold in a tin. Performance comes from the system as a whole: survey, preparation, controlled application to a defined coating thickness, skim finish and installation quality.
Insulation boards typically take 75–110 mm off each wall — costing 3–11 m² of floor space across a typical home, requiring skirting removal, socket repositioning and window reveal rebuilds.
Heat Halo is a few millimetres. The room stays the room.
External wall insulation changes the appearance of a building and is often refused on heritage or period properties.
Heat Halo is applied internally, leaving the exterior unchanged. It's often the only practical option for listed and conservation-area homes.
"The value is in the system — not a product in a tin."
Build Test Solutions Ltd, Binfield, Berkshire — 18-day in-situ BS EN ISO 9869 test, April 2026.
Why this matters
The thermal paint market has a poor reputation — with good reason. DIY retail products have consistently failed to deliver meaningful heat retention and the category has accumulated justified scepticism.
Heat Halo works differently — and that difference is demonstrated through independent testing.
| Feature | DIY thermal paints | Heat Halo |
|---|---|---|
| Who applies it | Homeowner / DIY | Trained specialist contractors only |
| Application control | Variable roller application | Professional spray, controlled film thickness |
| Finish | Painted surface | Conventional plaster skim + decoration |
| Independent testing | Rarely, or not to construction standards | BS EN ISO 9869, independently reported |
| Vapour permeability | Often not addressed | Vapour-permeable by design |
| Warranty | None or product-only | 10-year installation-backed system guarantee |
| Procurement confidence | Low — category has poor track record | Specification-grade, documented QA |
Who Heat Halo is for
Homeowners and Housing Associations come to Heat Halo for the same reason: the usual insulation routes are too disruptive, unsuitable for the building, or simply not practical.
Homeowners
Once loft insulation and windows are in place, the walls are often the largest source of heat loss — and the hardest to address. External insulation is frequently refused on period properties, while internal boards lose valuable floor space. Heat Halo is the professional alternative.
Typically specified where
Housing Associations
Older solid-wall stock presents persistent EPC, condensation, mould and fuel poverty challenges — but conventional retrofit can be too disruptive, too costly, or unsuitable for the building fabric. Heat Halo is structured for controlled 5–20 property pilots, generating measurable evidence before wider rollout.
About the company
Heat Halo was developed in response to a recurring problem: a large category of solid-wall homes for which conventional insulation routes either don't fit the building, take too much space, or create disruption occupants can't realistically absorb.
The retrofit market had no clean answer.
Heat Halo is that answer: a professionally installed, spray-applied internal wall insulation system designed specifically for the properties existing solutions consistently underserve.
Heat Halo works exclusively through approved specialist contractors. Every installation starts with a defined suitability assessment and proceeds only where the system is the right fit.
Our approach in three points
Every Heat Halo installation is assessed before work begins, installed by approved specialists, and documented throughout.
That process is what protects performance — and what allows us to stand behind the system with a 10-year installation-backed guarantee.
Next step
Speak to Heat Halo about whether a professionally installed thin internal wall system is the right fit — for a homeowner property or a social housing pilot.
Or reach us directly:
surveys@heathalo.uk (homeowners) · pilots@heathalo.uk (housing associations)
