Cathyandmolly

Hi , I was wondering if any one can help me , I have a 8 month old Harrier pup , every time I turn on the central heating she runs outside scared , she has a doggie door so has 24 hour access to the backyard . The unit is in the roof, I turned it on this sunday and sat with her on the lounge to comfort her but she was so scare she was shaking, with winter coming I don't know how I can turn on the unit and have her calm . thanks in advance for any advise Cathy