A BBC (Bâtiment Basse Consommation) is designed to minimise energy consumption. To heat such a building efficiently, here are a few tips:

1. Use renewable energy sources
   Heating systems in a BBC should use renewable energy as much as possible. Heat pumps, solar thermal systems and wood pellet boilers are good options.
2. Insulation
   Make sure the building is well insulated. Insulation is the key to keeping heat in and minimising energy consumption.
3. Underfloor heating
   Underfloor heating is an effective option for a BBC. It distributes heat evenly and generally uses low-temperature water, making it compatible with heat pumps.
4. Controlled Mechanical Ventilation (CMV) double flow
   This system recovers heat from the exhaust air to preheat the incoming air, minimising heat loss.
5. Program your thermostat
   Use a programmable thermostat to control the temperature of each room independently and according to the time of day. This optimises energy consumption.
6. Enjoy the sun
   Let the sun come in during the day to heat your home naturally. 

Remember, the aim of a BBC is to be as energy-efficient as possible, so use these tips in conjunction with eco-responsible practices to minimise your energy consumption.