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Air-to-air heat pumps

Heat load surveys and system design

A heat load survey works out how much heat each room gains in summer and loses in winter, from its size, glazing, orientation, insulation and use. It is the basis for choosing unit sizes, outdoor unit capacity and pipe routes, and it is the step that separates a system that works from one that is merely installed.

  • from £395Guide price
  • Survey 1–2 hoursTypical time
  • AnyCapacity
Get a guide price0800 088 6341
Heat load surveys and system design
  • Free survey and written quote
  • Refrigerant work by F-gas certified engineers
  • Price fixed in writing
  • England, Scotland, Wales and NI
  • Cools in summer, heats in winter

Who it suits

  • Anyone getting a new system
  • Self-builders and architects
  • Builders needing a design pack
  • Heat pump grant applications

What do you measure?

Room dimensions, window sizes and orientation, wall and roof construction, insulation, occupancy and equipment such as computers or ovens. For heating designs we use your area's design winter temperature. The result is a capacity for each room and the whole building.

Is the survey free?

Yes, the site survey and sizing are free with every installation quote. For architects, developers and contractors who need a standalone design pack with drawings and equipment schedules, we quote separately.

What is included

  • Room-by-room heat gain and heat loss
  • Equipment selection and outdoor unit sizing
  • Pipe and drain routes
  • Electrical load for your electrician
  • Noise check to the nearest neighbour
  • Written proposal with options

Heat load surveys and system design prices

Guide prices for heat load surveys and system design run from £395 to £1,250 for a standalone design pack, including VAT, depending on the options below. Free with every installation quote; standalone packs for contractors and architects. The survey turns this into a fixed written price.

Home survey

Free
inc VAT

Free with an installation quote.

Balanced choice

Design pack

£395–£795
inc VAT

Drawings and schedules for one home.

Self-build pack

£695–£1,250
inc VAT

Whole-house design for a new build.

UK middle prices. London and the South East are typically higher and much of the North, Scotland and Wales a little lower; see your area page for a local figure.

FAQ

Heat load surveys and system design: your questions

Why can't you just quote from floor area?

Two rooms the same size can need very different units because of glazing, orientation and use. Sizing from floor area alone is the main cause of systems that never feel right.

How long does a survey take?

One to two hours for most homes.

Do I get the calculations?

Your quote shows the capacity chosen for each room. Standalone design packs include the full calculations.

Related

Often considered alongside

Air-to-air heat pumpsEfficient heating and summer cooling from the same system, with a possible £2,500 grant.Learn moreDucted air conditioningHidden units in the loft or ceiling void, with only slim grilles on show.Learn moreAir conditioning servicingClean, check and test, so the system runs efficiently and lasts.Learn more

Where we fit

Surveys and design by area

Local guide prices, planning notes and towns for every county and region we cover.

Next step

Ready for a cooler summer and a cheaper winter?

Book a survey, or get a guide price in about a minute with our online tool.

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