<html><head></head><body><div class="yahoo-style-wrap" style="font-family:verdana, helvetica, sans-serif;font-size:16px;"><div dir="ltr" data-setdir="false">Good Morning:</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I have adding ERV to PVVT systems in apartments. Before adding the ERV, my space temperatures were fine. Now after adding ERV, the heating is some 4000 hours off. What control must I add to correct this?</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Thanks in advance.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">John R Aulbach, PE</div></div></body></html>