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11692 W. Alfred Ct.

Boise, Idaho 83713

Phone: (208) 995-5348

www.criterionpropertyinspection.com

Home Periodic Maintenance and Energy Efficiency Recommendations

Air Conditioner

If the air conditioning unit is window mounted, remove it in the fall, or provide with a suitable weatherproof cover. This will

prevent excess air infiltration into the home or property during the cold months of winter, will reduce heating costs, and will

extend the operating lifetime of the air conditioning unit.

If the unit is a central air conditioner, perform the following preventive steps in order to increase the unit’s efficiency, and

prolong its operating lifetime:

Clean evaporator and condenser air conditioning coils. Dirty or fouled coils in these components can reduce system

efficiency by as much as 50% in even minor cases of fouling. This is particularly important at the condensing coils which,

due to their configuration and outdoor location are especially susceptible to fouling by dirt, leaves, and other detritus.

Additionally, the evaporator is equipped with radiative fins similar to those found in your vehicle radiator. Inspect these

fins for signs of damage, especially bent fins. If bent fins are observed, they can be repaired by use of a “fin comb”

available at most auto parts stores.

Check the unit’s refrigerant charge. Some units are equipped with a sight glass in the high pressure refrigerant discharge

line leading from the refrigerant condenser to the evaporator (which usually located in the central heating unit plenum). If

bubbles are observed in the sight glass during operation of the air conditioner, the unit lacks sufficient charge, and must

be serviced by a professional. If a sight glass is not present, inspect the evaporator return line. This line is larger in

diameter than the high pressure line, and should be covered by an insulation jacket. Place your hand on this line where it

enters the unit (typically there is a low pressure isolation valve where the line enters the condenser). This line should be

cool to cold after approximately 15 minutes of operation.

The air conditioner evaporator unit’s location is equally important for efficient operation. Air flow through the unit should be

unobstructed for at least 12” in any direction. Also, because the heat transfer is proportional to the difference in

temperature between the compressed refrigerant gas (fixed temperature), and the outside air temperature (variable),

direct exposure of the condenser to sunlight will decrease the unit’s efficiency.

Attic

Inspect the attic area and the underside of the roof annually for signs of water leakage, or excessive condensation.

Ensure that attic vent opening are not blocked. Blocked vent openings, while beneficial in the winter, prevent the

dispersion of water vapor from the attic to the building exterior and may eventually cause delamination of the roof

sheathing. Additionally, even a normally vented attic may easily be as much as 60 °F, or more, hotter than ambient air

temperature.

Consider installing a thermostatically controlled attic exhaust fan. As mentioned above, heat gain due to solar heating can

greatly increase the energy required to cool a structure during summer months. An attic fan can reduce this temperature

to near ambient temperatures. Additionally, it may make you eligible for certain tax credits (check with your local utility for

more information).

Consider adding additional insulation. Idaho is in the U.S. department of Energy Zone 3, and R-38 insulation is

recommended for attic spaces. Care should be exercised when installing additional insulation and the services of a

professional should be considered. Insulation derives its value in large part from the air trapped within it. If the additional

insulation compresses the existing insulation, little or no benefit will be realized.

Crawlspace

Examine the crawlspace for signs of water leakage annually.

Check any central air ducting to ensure that it is insulated, and to ensure that there are no gaps at the duct joints which

may allow conditioning air to escape the duct system.

If the foundation stem walls and sub-floor are not insulated, consider insulating both.

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