1252 General rule for duct work adequacy
1253 Flow of cooled air - older-style ductwork
1254 Flow of cooled air - modern ductwork
1255 High and low returns
1256 Testing cold air returns
1257 Ducts in concrete floor slabs
1258 Air return outside room
1259 Close humidifier damper in summer |  1260 Vapor barriers and air conditioning ductwork
1261 Thermostat - bi-metallic (mercury bulb)
1262 Thermostat - bi-metallic (snap action)
1263 Poor location for thermostat
1264 Typical compressor life
1265 Three types of evaporative coolers
1266 Whole house fan
1267 Whole house fan - inadequate attic venting |
