9am – 3pm MHRV from conservatory to outside. Thermostatically controlled as well as timer. Located about 1m from ground level to preserve heat inside.

10am – 4pm MHRV from house to outside. Thermostatically controlled as well as timer. Located about 1m from ground level to preserve heat inside. 200ft³ exchange over this period, (say) 5 hours @ 40cfm

5pm – 10pm Inlet from conservatory blows hot air into house using simple heat transfer fan (Thermostat in case of house being hotter than conservatory). Inlet located about 4m from ground level to capture hottest air. Outlet at floor level. Thermostatically controlled as well as timer. (say) 5 hours @ 40cfm. Heat transfer fan from guest bedroom ceiling to dining area.

10pm – 8am Bedrooms exchange air with lounge. Located 2.4m from ground to ensure air is warm. Ecowindow unit (or thehvacshop.co.nz/products/grid?category=109) in each bedroom on a timer. Inlet and exhaust into the lounge area (Not side by side).

House air = 1,000m³ (= 1,000,000l) Each person (4) requires 10l/s = 2,400l/h. Equals 417 hours of air available. Replacement by MHRV during the day has to equal 24 x 2,400l = 60,000l/day = 200ft³. 200ft³ in (say) 5 hours = 40cfm minimum.

Overhang area is 2m wide. 15m long. 1m to 2.5m height. This equals 52,000l heat storage.