Dear Readers: How hot is your attic? We're coming into a time of year when it might be nice to know. Excess attic heat can slowly leak through the bedroom ceiling after hot summer afternoons-and that's what keeps you tossing and turning all night. Newer homes usually don't have enough fresh air flow through the their attic interiors. Builders are often blamed when winter winds blow snow in through the vents, so they supply the bare minimum of vented openings-and they have a...