(C) Carlisle Heating & Air Conditioning
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Frequently Asked Questions and Glossary

Q. How often should I have my equipment serviced?
A. Heating and air conditioning equipment should be serviced twice a year, once before each cooling season and once before each heating season.

Q. Why should I have my equipment serviced?
A. You can easily have a problem with your system and not know about it, which can cause high utility bills and decrease the life of your system. Having a yearly maintenance plan gives you peace of mind and your system will give you peak performance for many years.

Q. What does SEER mean?
A. Seasonal Energy Efficiency Ratio. A measure of seasonal or annual efficiency of a central air conditioner. The higher the seer number, the more energy-efficient your system will be.

Q. Will a programmable thermostat reduce my utility bill?
A. Yes, programmable thermostats may reduce your bill up to 30%, by programming your thermostat to be at a higher setting when nobody is home.


AFUE - Annualized Fuel Utilization Efficiency is a measure of your furnace's heating efficiency. The higher the AFUE, the more efficient the furnace.

Air Flow - The distribution or movement of air.

Air Handler - The indoor part of an air-conditioner or heat pump that moves cooled or heated air throughout the ductwork. An air handler is usually located in the attic or crawl space of your home or in a closet.

BTU - British Thermal Unit. One Btu is the amount of heat required to raise one pound of water by one degree Fahrenheit.

Carbon Monoxide – An odorless, colorless, tasteless, poisonous and flammable gas that is produced when carbon burns with insufficient air.

CFM - Cubic Feet per Minute. This measurement indicates how many cubic feet of air pass by a stationary point in one minute.

Compressor - The part of the outdoor air- conditioner or heat pump that compresses and pumps refrigerant to meet cooling requirements.

Damper - A movable plate, located in the ductwork, that regulates airflow.

Ductwork - The method by which air is distributed from the furnace or air handler.

Energy Star® - An EPA ( Environmental Protection Agency) designation attached to HVAC products that meet of exceed EPA guidelines for high- efficiency systems.

Evaporator Coil - The part of the air conditioner or heat pump that is located inside the air handler or attached to the furnace. Its primary function is to absorb the heat from the air in your house.

Heat Exchanger - Located in the furnace, the heat exchanger transfers heat to the surrounding air, which is then pumped throughout your home.

Heat Pump - A heat pump is an HVAC unit that heats or cools by moving heat. During the winter, a heat pump draws heat from outdoor air and circulates it through your home's ductwork. In the summer, it reverses the process and removes heat from inside your home and releases it outdoors.

HSPF - Heating Seasonal Performance Factor is the heating efficiency rating for heat pumps. The higher the rating, the more efficient the heat pump.

HVAC - Heating, Ventilation and Air Conditioning.

Merv Rating - Minimum Efficiency Reporting Value rating of a filter describes the size of the holes in the filter that allow air to pass through. The higher the Merv rating, the smaller the holes in the filter, the higher the efficiency.

Package Unit - A heating and cooling system contained in one outdoor unit.

R 410A\ Puron® - A chlorine- free refrigerant that meets the EPA's newest, most stringent environmental guidelines.

Refrigerant Lines - Two copper lines that connect the outdoor air-conditioner or heat pump to the evaporator coil.

SEER - Seasonal Energy Efficiency Ratio is an energy efficiency rating for air-conditioners, the higher the SEER rating, the more you save.

Split System - An HVAC system in which some componets are located inside the structure of the house and some are located outside.

Thermidistat - Monitors temperature and humidity and adjusts heating and cooling system to maintain desired levels.

Ton - Unit of measurement for determining cooling capacity. One ton equals 12,000 Btuh.

Up flow - When an air handler of furnace is installed in an upright position and circulates air through the side or bottom and out through the top.

Variable Speed - A motor that automatically adjusts the flow of warm or cool air for ultimate comfort.