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Coulson's Heating & Cooling provides the very best heating, duct and AC in Johnston City, Marion and West Frankfort, IL | HVAC Troubleshooter. This manual covers the following models: • T705 Do not operate the cooling system if the outdoor turns on the air conditioning mode. Installation Instructions for. Heating & Air Conditioning. 1E78. 5/2 Day Programmable Thermostat. CONTENTS. Preparations . Whether you need repairs right away or simply want to avoid costly problems down the road, Coulson Htg & AC Inc is ready to take care of your needs. Our service