got in touch with an aircore tech he said that the new unit outside which doesn't have a restrictor in the small line valve like the origanal comfort maker had doesn't matter as far the the temp of air goes. that clears that question up. i took off side cover in attic unit made sure the sensing bulb was tight on the big line. it's positioned at the two o clock position. the instalation manual that came with the the arcoair unit shows an illustration of the sensing bulb at either the 4 oclock or 8oclock position. this from the instructions showing the instalation of a trx valve in the attic unit if it didn't already have atrx valve . could this make a difference. should i change the position of the sensing bulb ?