Describe the room through the day
Tell us when the room becomes uncomfortable and when you need to use it. A bedroom at night and a working space through the afternoon create different priorities. Describe the windows, sunlight, existing shading and whether opening a window is practical.
Bring any planned alterations into the brief. Changes to glazing, layout or room use may affect what you want from the system. Discuss ways of limiting unwanted heat alongside mechanical cooling so the proposal responds to the room as a whole.
Look beyond the indoor unit’s appearance
Consider where you sit, sleep or work, where furniture needs to remain and how you want to use the controls. Ask where the unit and its connections would be visible and how it will be reached for maintenance.
If several rooms need cooling, explain their different patterns of use. The design should respond to those needs rather than assume every room requires the same arrangement. Ask what compromises come with the proposed number and position of units.
Give the outdoor unit a proper place
Walk through the proposed location before treating it as decided. What is beside it, above it and on the other side of the boundary? How would the equipment reach the position, and how would it be accessed later?
Review pipe routes and mounting alongside visual impact. A screen or enclosure is an additional design choice, with its own space and access implications. It should be assessed with the selected equipment. Do not assume that hiding a unit from view makes every other issue disappear.
Discuss sound in the places that matter
Ask how the installation relates to your own rooms and neighbouring windows, particularly for overnight use. Compare the complete proposals, not a single advertised sound number.
For a qualifying heat-pump permitted-development proposal, the MCS sound assessment is one relevant check. Where a planning application is needed, confirm the council’s evidence requirements. Sound and appearance deserve attention while alternative positions remain available, before the design becomes difficult to change.
Trace where the condensate will go
Ask for the drainage route to be explained along with the refrigerant pipework. Where will water leave the indoor equipment, where is it intended to discharge and how will the route fit the building?
If the proposed arrangement needs a condensate pump, discuss its position, access, sound and maintenance implications. Include any external pipework in the visual and consent discussion. Drainage should be a settled part of the proposal, rather than a route improvised after the indoor unit has been chosen.
Check the actual system and permission route
Equipment used for heating and cooling may qualify under the domestic air-source heat-pump rules, subject to all conditions. Equipment used solely for cooling cannot use that Class G route. The name ‘air-conditioning’ alone does not settle the answer.
Check the property, building use and proposed installation with current official guidance. Flats, shared outside spaces, listed buildings and conservation areas call for specific questions. In Hampstead Garden Suburb, establish whether separate Trust consent applies. Resolve relevant ownership consent as well as the planning position.
Know who will carry the design through
The proposal should identify the equipment, intended work and responsible installation entity. Confirm relevant refrigerant qualifications and company certification rather than assuming that a personal qualification covers the business.
At HeatMason, Amir leads the survey and design, oversees installation, commissions the system and completes handover. Tell us how you want to use the rooms so that the controls and final setup can be discussed in those terms.