• my brother has bought a place, 1960s maisonette. Cavity wall, with insulation. Floor and attic with minimal insulation but they will improve that.

    The place has electric storage heaters and no gas boiler or pipes for rads. Is an air to air the best bet for them? Anyone here have experience with that sort of set up?

  • The biggest issue will likely be where it’s sited, needs easy access for servicing/not at height, not near a neighbours window due to noise and not fall foul of planning/conservation/lease conditions.
    Bit easier if they are on the ground floor.

  • Do you mean ducted air-to-air or a unit in each room? An unusual choice (in the UK) either way.

    And they're excluded from the Boiler Upgrade Scheme.

  • Well you having to do everything from scratch, does the street have gas?

    You'd need to weight up the costs and how much he has to spend.

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