Planning a warm home: check the rooms beyond the living area

Draw your winter day onto the plan

Take a floor plan and mark where each person spends time in the morning, during the day and after dinner. Include a bedroom used for study, a bathroom used before sunrise and any room where someone sits still for long stretches.

Beside each room, note whether its door is normally open or closed. Be honest about this. If someone needs a closed office door for calls, the comfort plan should accommodate that preference. I would also note whether the house is occupied all day or needs to be comfortable when everyone returns.

• Which rooms are used at the same time?
• Where do people have different comfort preferences?
• Which spaces are used occasionally but still need a clear heating approach?

Look at what keeps the warmth in

BRANZ's Level guidance identifies inadequate insulation and unwanted air leakage among the reasons homes become cold. I would ask the designer to explain the proposed approach to the roof, walls, floor and windows as a connected whole, including the places where those parts meet.

For a renovation, ask what is known about the existing construction and what needs investigating. It is useful to establish which improvements depend on opening up linings before agreeing the sequence of work. Keep planned ventilation in the conversation too; stopping unwanted draughts should be coordinated with the home's fresh-air provision.

Our Alpine Retreat project account describes changes to room arrangements alongside upgrades to insulation, windows and internal linings. That is a useful example of bringing comfort into the renovation scope while the spaces themselves are being reconsidered.

Ask how each room receives heat

MBIE's heating guidance distinguishes single-room heat pumps from systems serving a whole house. I would ask the heating designer to mark the spaces the proposed equipment is intended to serve, then compare that drawing with your winter-day plan.

Imagine a hypothetical household with someone working in a small office while another person uses the living room. The office door needs to stay shut. Ask how the office will be heated under that condition, and how its temperature can be controlled without making the living room uncomfortable.

Have the team explain the sizing and distribution assumptions for your actual house. A product name or a unit drawn in the hallway does not tell you what conditions are expected in each room.

• What room temperatures and outdoor conditions are being designed for?
• Does the proposal assume internal doors remain open?
• Where will controls and temperature sensors sit?
• How will the system respond when only part of the home is occupied?

Make the proposal easy to check

I would ask for a short room-by-room explanation showing the heating provision, controls and ventilation approach. Review it beside the furniture layout so the places you actually sit and sleep are part of the conversation.

Level recommends modelling to verify year-round thermal performance when using passive design. Ask what assessment is appropriate for your project, which assumptions it uses and whether summer comfort has been checked too. Good winter intentions still need testing against the proposed building.

Bring the uncomfortable moments with you

If you are planning a new home or renovation, bring your marked-up plan and a short list of the winter frustrations you want to leave behind. We can discuss which questions belong in the architectural brief and where specialist heating or building-performance advice would help.