A single split typically connects one indoor unit to one outdoor unit. It can suit a defined room or zone where the route, drainage and outdoor position all work.
What this service usually involves
- Correct output for the room rather than a larger-is-better approach
- Outdoor unit airflow, vibration isolation and service access
- Pipework finish and condensate route
- Heating performance if the unit will run year-round
What a useful quote should cover
Ask for the same scope from every company: rooms or zones, outdoor position options, pipe and drain routes, electrics, access, working hours, VAT, exclusions and warranty route. A low headline total with vague allowances is harder to compare than a complete written proposal.
Compare evidence, not badges
Ask each business for the legal name that will contract with you, relevant individual and company credentials, insurance details, equipment schedule, exclusions, warranty route and payment terms. Verify evidence with the issuing body where possible. Read what we check and what you should verify.
Related next steps
- Estimate installation cost or plan servicing
- Use the quote comparison checklist
- Browse installers by area
Related guides
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Useful official references
- GOV.UK: fluorinated gas guidance collection
- The Fluorinated Greenhouse Gases Regulations 2015
- Energy Saving Trust: air-to-air heat pumps
- Met Office: UK climate averages
- Planning Portal: air conditioning
- GOV.UK: Approved Document O overheating
- UK Health Security Agency: hot weather and health
- Ofgem: energy price cap
- CIBSE knowledge resources
- ASHRAE datacom resources
- Leasehold Advisory Service
- GOV.UK: air conditioning inspections for buildings
- UKHSA: Heat mortality monitoring report, England 2025
- UKHSA: Beat the heat, staying safe in hot weather
- GOV.UK: Heat summary, climate policies and indoor health