800 square meters is 8606.72 square feet or about .20 acres in the US. That would be about a average surburban lot. A big outhouse but then you need a drainage field. An acre is 43,560 square feet by comparison. My house sits on 5.6 acres or 243,936 square ft. The upper level is 3600 square ft and the lower 2400 square ft.
The house definitely has air (geothermal heat pump actually). Highest temp so far this summer was 107F (42C). Highest temp I've seen was 116F (47C) so the air runs but if the nights drop into the 60F range the air goes off and windows open. The dam is hydroelectric so power is reasonable and we are all electric except for a gas-log fireplace and a propane (backup) water heater