Furnace should have an on off switch near it. Turn it off. Turn wall thermostat off.Air filter screens are flat and wide. Typically they slide into the side of your furnace. Some slide in the inside...
It could be a lot of things but let's first eliminate the obvious from easy to harder: Is the thermostat set to heat and above the current room temperature? Is it set to fan or Auto? Do you have gas...
The internal temperature will depend on various factors such as the load on the balloon, it's size, and the ambient air temperature. The loading of the balloon will generally be arranged such that...