Heating with Gas Furnaces

gas heating furnaceGas fired heaters or furnaces provide warm, consistent heat for your home or business by creating and circulating warm air through the duct work of your house and transferred to your house or business.

The heat to create the warm air is created by burning natural gas. The hot gases and heat that is created during the combustion process is transferred through a heat exchanger which is basically just a series of curved metal tubes which passes through the air path of the unit. As the heat passes through the pipes is transferred through the metal and into the air passing over it heating it in the process. The left over gasses are then passed out of the system through a metal or plastic vent pipe and into the outside atmosphere.

gas furnaceCarbon Monoxide is a colorless odorless and tasteless gas or liquid which is a byproduct of burning kerosene, gas, oil, charcoal, wood, tobacco, gasoline and other petroleum products and comes from incomplete oxidation of the carbon during the combustion process. In appliances that burn fossil fuels like natural gas are properly used and maintained the tiny amounts of CO produced are not dangerous but when they are used or maintained improperly dangerous levels of CO can produce dire results. Hundreds of people each year are killed by accidental CO poisoning. Most of the time the symptoms in these cases were evident before hand but not properly recognized as Carbon Monoxide poisoning.

AFUE calculates the percentage of heat delivered to your house and compares it to the amount of fuel that you supply to the heater. For example a heater that has a 80% AFUE rating converts 80% of the fuel that you supply to heat and the other 20% is not converted to heat and effectively lost out the flue or chimney. AFUE is limited in that it only refers to the unit's fuel usage and not its electrical consumption.

gas furnacesThe government's minimum AFUE rating for heaters is 78%. Many furnaces and heaters manufactured before this rating went into effect in 1992 had AFUE ratings as low as 60%. Heaters with AFUE ratings of 78% to 80% are the most common. If you have a heater with an AFUE of about 60%, you could save significantly on your heating bills by replacing it with a higher efficiency heater. Many times the cost is paid back through savings on lower utility bills. If you live in a cold area where fuel is very expensive consider a high efficiency heater with a rating of 90% or higher. Consult a reputable air conditioning and heating contractor to help you decide which system is right for your area.


Click here to Order Parts from Ra-Jac Services Online Air-Conditioning and Heating Store

Take the guesswork out of shopping for high quality air conditioning and heating parts for your home or office. We offer only top quality parts that the professionals are using. Let our 40+ years in the air conditioning, heating, ventilation and refrigeration industry work for you.


Click here for 10 Reasons to choose Ra Jac as your Air Conditioning and Heating Company for Repair and Installation Service.

Ra-Jac Air Conditioning & Heating has proudly served Galveston County TX since 1966. We pride ourselves on providing top notch service on residential and commercial air conditioning, heating, and refrigeration in the Southern Texas area.


We offer prompt and courteous service on air conditioning, heating, and refrigeration equipment.

Algoa / Arcadia / Bacliff / Bayou Vista / Clear Lake City / Clear Lake Shores / Dickinson / El Lago / Friendswood / Galveston / Hitchcock / Kemah / La Marque / League City / Nasa Area / Nassau Bay / San Leon / Santa Fe / Seabrook / Taylor Lake Village / Texas City / Tiki Island / Webster


Rajac airconditioning heating refrigeration