[dt_list style=”1″ dividers=”true”] [dt_list_item image=””]You turn the thermostat up to a higher temperature but still are not comfortable[/dt_list_item] [dt_list_item image=””]Your heating system make unusual noises when it comes on[/dt_list_item] [dt_list_item image=””]You smell a strange odor coming from your supply registers[/dt_list_item] [dt_list_item image=””]Your home energy bills have spiked[/dt_list_item] [dt_list_item image=””]Certain rooms of your home are colder...