1.        DUCTWORK

2.        CONDENSING UNIT

3.        EVAPORATOR COIL

4.        HEATER/FURNACE

5.        SUPPLY REGISTER AND RETURN AIR GRILLS

6.        ATTIC INSULATION & VENTILATION

Also ask for a Mechanical inspection of your system, including but not limited to: 

ü        CHECK REFRIGERANT LEVELS TO MANUFACTURERS SPECIFICATIONS USING SUPERHEAT

 OR SUB-COOLING

ü        CHECK AMPERAGE DRAW PER UNIT DATA PLATE FOR COMPRESSOR

ü        CHECK AMPERAGE DRAW PER UNIT DATA PLATE FOR CONDENSER FAN MOTOR

ü        CHECK AMPERAGE DRAW PER UNIT DATA PLATE FOR INDOOR BLOWER MOTOR

ü        CHECK AND CLEAR DRAIN LINES

ü        CHECK ALL ELECTRICAL CONNECTIONS

ü        CHECK AND FUNCTION ALL CONTROLS AND SAFETIES

ü        CHECK CONDITION OF HEAT EXCHANGER

ü        CHECK CONDITION OF EVAPORATOR COIL

ü        CHECK CONDITION OF CONDENSING COIL (WATER WASH IF NECESSARY)

ü        VISUALLY INSPECT ALL VISIBLE AND ACCESSIBLE SUPPLY DUCTWORK

ü        VISUALLY INSPECT RETURN AIR DUCTWORK AND CHASE

Finally,

?          CHECK SUPPLY DUCTWORK FOR AIR LEAKS

?          CHECK TOTAL SYSTEM STATIC PRESSURE

?          CHECK FOR LEAKAGE AROUND ALL ACCESSIBLE SUPPLY REGISTERS

?          DETERMINE SYSTEMS FUNCTIONING AIR FLOW CAPACITY

?          DETERMINE SYSTEMS FUNCTIONING BTU CAPACITY

?          DETERMINE SYSTEMS FUNCTIONING EFFICIENCY RATING

Get a written evaluation of your system. Get a written proposal of any suggested work to be done and always get a second opinion.