Your choices:
1 Comfortable indoor climate; 2 Water
| What is your resource? | What do you want to deliver? | What is the service the customer wants? |
| Biomass (digestible sludge) | District cooling | 1 Comfortable indoor climate |
| Biomass (fermentable sludge) | District heating | Electricity |
| Biomass (solid) | Electricity | Process cooling (< 0 °C) |
| Geothermal | Fuel: Gaseous | Process heat/steam (50 - 150 °C) |
| Sunshine | Fuel: Liquid | Process heat (150 - 1000 °C) |
| 2 Water | Fuel: Solid | Process heat (> 1000 °C) |
| Wind | Local cooling (ind. house) | Transport |
| Residual oils/fats etc | Local heating (ind. house) |
Flowing water should be used for the production of electricity and nothing else. Electricity should be used for climate control only in such cases when the thermodynamically better alternatives district heating and district cooling are not feasible.
Thus, this combination can be recommended only when it comes to climate control in buildings outside densely populated areas.
Todays' air-conditioning units will provide air-borne heating as well as cooling in one single unit and often such units will be found in the individual rooms in single-family houses.
For the use of renewable energy in combination with AC-units there is mainly one alternative, and that is to provide at least part of the electricity need for the house by local, individual, generation. This can be achieved by a micro-hydropower installation or simply by contracting the electricity delivery to be 100% hydropower.