Congratulations on moving in to your new home!
Your home has been built to exacting standards in order to ensure the highest level of energy efficiency - and lowest operating cost for you. The walls and ceilings are heavily insulated and the structure is designed to be as airtight as possible.
In addition to the primary heating system (either a gas boiler or air to water heat pump), your home also has a mechanical heat recovery and ventilation system (HRV). This system extracts warm air from bathrooms and expels it outside, but while doing this it uses a heat exchanger to recover the heat from this air, using that heat to warm incoming fresh air. This saves energy and ensures your home has a constant supply of fresh air.
Its really important that HRV system is left running and is maintained. Due to the airtightness of your home, without mechanical ventilation, the air will become stale and can cause mould and mildew to appear inside your home.
Thankfully, the maintenance of the HRV unit is simple and inexpensive. Every six months, you should remove the filters from the unit and vacuum them. Replace the filters every 12-18 months.