Supplemental propane heaters can be added for additional heat or to reduce engine run time. This is very efficient for heating and air-conditioning in desert communities where the nights are cold and the days are warm. In winter the heat during the day is absorbed by the water and during nighttime provides heating. The heat pump is then used to supplement the heating and cooling effect as needed. The hydronic system facilitates the recycling of engine exhaust heat for space heating.
Many homeowners enjoy heated floors.
Here plumbing is buried under the floor and the hot water passes through heating the floor and the room. The hydronic system costs more to purchase than the unitary and split systems. As with any plumbing system there is always the possibility for water leaks. Some systems may incorporate a central heat exchanger and others will use heat exchangers in each room. Air is circulated between the house and the Micro-cogen unit.