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ASHP guide

Air source heat pump calculator: inputs before output

Calculator outputs are only as good as the evidence behind them. Survey quality decides whether the numbers hold up on site.

15,000+ surveys completed across the UK · Pack and organised photos available in the portal immediately on completion of the visit · EPC by next morning in the standard flow.

Guide

Inputs that make ASHP outputs usable

What strong looks like

Capture standards

  • Room-by-room dimensions and exposure captured with supporting context
  • Emitter condition and layout documented before sizing decisions
  • Plant location, access routes, and constraints photographed clearly
  • Assumptions recorded so design teams know what is confirmed vs pending
Where time is lost

Where teams lose time

  • Missing evidence around emitters and routing
  • Assumptions buried in ad-hoc notes
  • No consistent move from survey to design review
Why it helps

Why teams use Vertex

  • Clearer packs for office and design review
  • Faster quoting with less chasing
  • Install teams start with clearer site context
  • Portal visibility across teams and roles
Useful next pages

Related pages and proof