My master bedroom has a ceiling fan. The stairs to the top floor, which it i on, has a ceiling fan. I have switched them over to the winter direction. The house is set to 22C/71.5F Upstairs in the bedroom, it is 69F The house is a 2 story house. The thermostat is on the main floor. The vent in the Master Bedroom is not blocked. Any reason why it would be so cold?