Hi sirs
One two-storey seaside villa (250m2). Need comfort AC with hot water supply. The solutions may be as follows:
1) Air cooled heat pump + FCU +heat reclaim hot water parellel with solar water heater;
2) GSHP +cooling/heating panel ceiling + fresh air unit+hot water with reclaim heat and solar water heater or elctrical heater
3)Air cooled hp or GSHP with air duct + fresh air ventilator

etc.

How to determine which one is best? Based on the cost or the comfort level or other things?
pls advise

thanks & regards
LC