What Can HEET Offer?
Loft or Roof Insulation
Up to 25% of heat in a home can be lost through the roof. Adding or improving insulation in your loft or roof helps keep your home warmer and more energy-efficient.
- Ideal insulation thickness: 250mm to 300mm
- Even if you already have insulation, it may be possible to improve it
Cavity Wall Insulation
Around a third of heat is lost through uninsulated walls. Cavity wall insulation fills the gap between two walls with insulating material to reduce heat loss.
How It Works
- Small holes are drilled into external walls
- Insulation (mineral wool, polystyrene beads, or foam) is injected
- Holes are filled and made unnoticeable
Is It Suitable for Your Home?
- Most homes built after 1920 have cavity walls
- Homes built before 1920 likely have solid walls and need solid wall insulation
- Homes built after the 1990s may already have cavity wall insulation
- Not suitable for flats unless all owners agree to insulate the entire block
Under-Floor Insulation
Heat can escape through floors, especially on the ground floor or above unheated spaces like garages.
Types of Floors
- Solid concrete floors: Can be insulated with rigid boards or internally (during replacement)
- Suspended timber floors: Common in older homes; look for air bricks below floor level
Important:
Do not block air bricks. These are essential for ventilation and prevent damp and rot.
External and Internal Wall Insulation
Uninsulated homes can lose up to a third of their heat through walls. The right insulation depends on your wall type:
Solid Wall Insulation
Solid walls don’t have a cavity, so they can’t be filled like cavity walls. Instead, they can be insulated in two ways:
-
Internal Wall Insulation (IWI)
- Rigid insulation boards or stud walls filled with mineral wool
- Slightly reduces room size
- Damp issues must be resolved before installation
-
External Wall Insulation (EWI)
- Insulation is fixed to the outside of the home
- Covered with plaster or cladding that can be decorated
- Improves weatherproofing, soundproofing, and protects brickwork
- May require planning permission
Double-Glazed Windows
Windows are a major source of heat loss. Upgrading to double or triple glazing helps:
- Reduce energy bills and carbon emissions
- Improve sound insulation
- Prevent draughts
How It Works
- Double glazing uses two panes of glass with a gap between
- Triple glazing uses three panes for even better insulation
- Windows can be made of many different materials, which have differing impacts on the energy performance of the property. These are measured using an energy rating called a u-value, on a scale from A++ to E.
- New windows should include trickle vents to maintain ventilation and reduce condensation
Air Source Heat Pumps (ASHPs)
ASHPs absorb heat from the air outside and use it to heat your home and hot water. They are:
- Low carbon
- Cost-effective
- Supported by government targets to install 600,000 per year by 2025
How They Work
- Heat is absorbed into a fluid, compressed, and transferred to your heating system
- Most common type: air-to-water heat pumps
Is Your Home Suitable?
- Requires space outside for the unit
- Works best in well-insulated homes with central heating
- Suitability will be assessed during your home survey
Rooftop Solar Panels
Solar photovoltaic (PV) panels convert sunlight into electricity, even on cloudy days.
Benefits
- Reduce your energy bills
- Lower your carbon footprint
- Save up to 1.6 tonnes of CO₂ per year (Energy Saving Trust)
If you notify your energy supplier, you may qualify for the Smart Export Guarantee (SEG) and receive payments for electricity exported to the grid.
Solar Battery Storage
Solar panels will create energy when there is daylight and you can use this solar electricity instead of buying it from your energy supplier. However, these panels don't work at night time (when you tend to use the most energy). So, what happens then?
If you don't have a battery you'll switch back to using energy from the national grid overnight which will cost you money. If you have a battery installed you can use any extra energy stored in the battery at night time. This reduces your reliance on the grid for electricity.
How It Works
- Stores excess energy generated during the day
- Reduces reliance on the grid at night
- Typically installed in the loft, garage, or under the stairs
The Importance of Ventilation
Energy efficiency isn’t just about keeping heat in, it’s also about letting fresh air in.
Poor ventilation can lead to damp and condensation. HEET ensures your home stays healthy by assessing ventilation needs before any work begins.
Types of Ventilation
- Extractor fans in kitchens, bathrooms, and utility rooms
- Air bricks under floors to prevent damp
- Wall vents for fresh air
- Trickle vents above modern windows
Our qualified surveyors will carry out a full home assessment to ensure your property remains well-ventilated and energy-efficient.
