Within the past few years the lenders have been requiring the appraiser to state if the utilities where on and working. I always state I am not a building inspector and cannot determine functional utility of all major components. My question is with regard to residential properties. I think I read somewhere that to test the heating component of a residential property it may need an outside temp below a certain degree. If so what is the industry standard? Is in line with the temp needing to be above 65 degrees for a cac unit?