Glossary of Terms

13 SEER

This is the new minimum efficiency standard (effective January 2006) for an air conditioner or heat pump. All units newly manufactured must meet this standard. Previously manufactured equipment may be sold, and installed until they run out of supply. SEER is defined later.

ACCA

The Air Conditioning Contractors of America, a national trade association that represents heating, ventilation, air conditioning, and refrigeration contractors.

AFUE

Annual Fuel Utilization Efficiency, a measure of heating efficiency. A higher AFUE denotes higher efficiency. The current minimum is 78%.

AIR HANDLING UNIT

Equipment with a heating element and/or cooling coil and other components in a cabinet or casing.

ARI

Air-Conditioning and Refrigeration Institute, a non-profit, voluntary organization composed of heating, air conditioning and refrigeration manufacturers. ARI publishes standards for testing and rating heat pumps and air conditioners.

BALANCING or AIR BALANCING

Adjusting an air conditioning system so that the right amount of air is delivered to the right places in your home in order to achieve the right heating or cooling effect.

BPI

The Building Performance Institute (BPI) offers nationally-recognized training, certification, accreditation and quality-assurance programs.

BTU

British Thermal Unit, the measurement of heating and air conditioning capacity. A BTU is the amount of heat that must be added to one pound of water to raise its temperature one degree Fahrenheit.

CFC

Chlorofluorocarbons, used as a refrigerant in air conditioners and heat pumps, linked to the depletion of the ozone layer.

BTUH

A Btuh is the number of Btus used in one hour.

COP

Coefficient of performance, an efficiency ratio that compares the amount of heat delivered to the amount of energy used. As with MPG on a car, the higher the score the more energy efficient the equipment is.

COIL 

A heating or cooling element made of pipe or tubing, usually with plates or fins.

COMMISSIONING

The final step in installing a heating or air conditioning system. Every component is checked and tested for compliance with codes, ACCA manuals, manufacturer requirements, and occupant needs. After commissioning, the technician will: provide documentation of testing, provide all equipment manuals, and show the homeowner how to operate the system.

CONDENSER (HEAT EXCHANGER)

The outside unit of a heating or air conditioning system. Here the refrigerant condenses from a gas to a liquid and hot or cold air from the building is released to the outside.

DECIBEL

Db is a rating system for noise levels. One decibel is close to the Just Noticeable Difference (JND) for sound level. Meaning if you can tell one sound is louder than another sound they are separated by at least one decibel.

DEHUMIDIFIER 

A device that removes excess moisture from the air.

DOE

The U.S. Department of Energy, the federal agency that sets industry efficiency standards.

DSP 

Discount Service Plan, which provides regular maintenance of your HVACR system. Most ACCA member contractors offer DSPs, although they may use different names for them, such as Maintenance Inspection Agreement, Planned Service Agreement, Energy Service Plan, etc.

DUCT

Conduits used to carry air. They can be round or rectangular, sheet metal or fiberglass or vinyl tubes. In air conditioning systems they carry air from the home to the air conditioning system or furnace and back to the home.

ERV

Energy Recovery Ventilator, a machine that draws fresh air into the home and exhausts stale air from the home. It uses a process to preheat or pre-cool (depending on the season) to reduce energy costs associated with conditioning the air.

ENERGY STAR®

A government supported branding used to identify energy efficient products. The branding was developed by the US Department of Energy and the US Environmental Protection Agency.

EPA

The U.S. Environmental Protection Agency.

FAN COIL

See AIR HANDLING UNIT

FURNACE

A self-contained heating unit that is designed to deliver heated air to a home.

GAMA

Gas Appliance Manufacturing Association is a national trade association serving the interests of manufacturers of gas, oil, and electric appliances and equipment, components and related products used in residential, commercial, and industrial applications.

HCFC

Hydrochlorofluorocarbons, used as a refrigerant in air conditioners and heat pumps. HCFCs were thought to contribute to the depletion of the earth’s ozone layer.

HEAT EXCHANGER

1. The part of a furnace that transfers heat from burning fuel to the air used to heat your home. Also, from a boiler to water for hydronic heating.
2. A device, such as a condenser or evaporator, in which heat is added or removed in order to heat or cool your home.

HEAT PUMP

A single refrigeration system designed to provide both heating and cooling. Compare to a furnace and an air conditioner, separate units that only heat or cool.

HRV

Heat Recovery Venilator, a machine that brings fresh air into a home through a process that preheats the air so it has less impact on your utility bill.

HFC

Hydroflorocarbon, used as a refrigerant in air conditioners and heat pumps. It has little or no effect on the ozone layer.

HSPF

Heating Seasonal Performance Factor, an equipment efficiency rating. As with MPG on a car, the higher the rating the more fuel efficient the equipment is. The current minimum is 6.8

HUMIDIFIER

A device that adds moisture to warm air for your home.

HVAC

Heating, ventilating, and air conditioning

HVACR

Heating, ventilating, air conditioning, and refrigeration

INFILTRATION

Air that enters your home through holes, gaps, and cracks, (e.g., plumbing or electrical holes, the heating and air conditioning system, doors, and windows).

IAQ

Indoor air quality

LATENT HEAT 

The energy that suspends moisture vapor in the air.

LOAD CALCULATION

A mathematical determination of how much cooling and heating (BTUs) an HVAC system must deliver for occupant safety and comfort. It is based on a variety of factors: square footage, building orientation, number of occupants, size and placement of rooms, number and size of windows and doors, amount of insulation, number of floors, and climate.

MANUAL D®

An ACCA procedure covering the proper design, installation, maintenance, and repair of ductwork.

MANUAL J®

An ACCA procedure covering the method for calculating heating and cooling requirements (load calculation) for single-family detached homes and mobile homes.

MANUAL RS®

An ACCA publication covering the design, installation, and commissioning of a residential HVAC system.

MATCHED SYSTEM

An air conditioner or heat pump system composed of equipment that has been certified by ARI to work together to deliver the specified heating and cooling capacity at the stated efficiency rating.

MOLD 

A natural byproduct of the fungi family that thrives when organic substances and water combine under certain circumstances. Mold reproduces via spores that can remain dormant, yet viable, for years. Many molds are beneficial. For example, they are the “bleu” in bleu cheese, and we use them to make wine, penicillin, and antibiotics. However, some molds can cause health problems.

NATE

North American Technician Excellence, the nonprofit organization that tests and certifies HVACR technicians.

R-22

A refrigerant containing chlorine used in air conditioning systems. The EPA has mandated that R-22 cannot be manufactured after 2010 because it has been linked to the depletion of the ozone layer and global warming. Most commonly referred to by its trademarked name, Freon.

R-410A

The refrigerant that replaces R-22. It does not contain chlorine and is not hazardous to the environment.

REFRIGERANT

A fluid that absorbs heat at low temperatures and rejects heat at higher temperatures.

REFRIGERANT CHARGE (or, “charging the refrigerant”)

The procedure an HVACR technician performs to ensure that the system has enough of the right kind refrigerant for peak operating performance.

RELATIVE HUMIDITY (RH)

The percent of moisture actually in the air compared to the maximum amount of moisture the air can hold at that temperature.

RETURN, RETURN AIR, RETURN SIDE

The path the air takes to get to an air-handling unit or furnace so it can be cooled or heated. It is the “return” path. The return side should be “balanced” with the supply side to ensure proper air flow and comfort.

SEER

Seasonal Energy Efficiency Ratio, an equipment efficiency rating that measures how much energy it takes to cool the air. As with MPG on a car, the higher the number the more efficient the unit. The current minimum is 10, which was considered “high efficiency” a few years ago.

SENSIBLE HEAT 

The temperature of the air. This type of heat is measured with a thermometer.

SPLIT SYSTEM

A two-component heating and cooling (heat pump) or cooling only (air conditioner) system. The condensing unit is installed outside, the air handling unit is installed inside (preferably in conditioned space). Refrigerant lines and wiring connect them together.

SUPPLY or SUPPLY SIDE

The part of an HVAC system that takes (supplies) the conditioned air from the air-handling unit or furnace to your home. The supply side should be “balanced” with the return side to ensure proper air flow and comfort.

Ton

A measure of energy equal to the amount of heat required to melt one ton of ice in a 24 hour period. 12,000 Btus = 1 ton.

ZONES, ZONED SYSTEM, ZONING

A single HVAC system that can meet different heating and cooling needs in different areas (zones). Each zone of a home has its own thermostat with which it can regulate the temperature and humidity in its area. One “zoned air conditioner” could be set for a high temperature in one zone and for a lower temperature in the other zone. Zone systems have two or more zones.

Welcome to John Betlem Heating and Cooling, Inc.

We are pleased to announce that Lang Heating and Cooling has merged with John Betlem Heating and Cooling, Inc. and we are now conducting business together under the name John Betlem Heating and Cooling, Inc.

John Betlem Heating and Cooling, Inc. has been a family owned and operated business serving the Rochester area for over 75 years, and we proudly hold similar values and philosophy for doing business that you have come to expect with Lang Heating and Cooling.

If you are a Lang Heating and Cooling customer, we will honor all present Service Plans with the exception of oil, as well as all warranties on previously installed HVAC equipment from Lang Heating and Cooling. Though we will now operate as one company, you can rely on the same professional working relationship you have always enjoyed.

If you have any questions or concerns, please call us at 585-271-8888. For those of you in the 315 area, please be sure to include 585 to ensure we receive your call. We look forward to providing you with the excellence and quality you deserve!

Thank you,

Kathy Betlem, Vice President
585-271-8888