HEATING 101

At Air Pro we take heating service seriously because HEATING IS OUR BUSINESS!

Here’s a little HEATING101.

Heat transfer is the key to heating of any kind.

Heat always travels from the (warmer) higher temperature object to a (cooler) lower temperature object.

Heat is measured in British Thermal Units, (BTU’s) the amount of heat required to raise the temperature of one pound of water one degree fahrenheit.

In a forced air heating system a heat source produces heat (BTU’s) and gives up that heat (BTU’s) to the cooler air in your home or office.

HEATING INSTALLATION

Air Pro is highly qualified, with over 35 years experience, in heating system installation. From gas furnaces, electric forced air furnaces, heat pumps, and duct design, sizing, and installation or gas piping design,sizing, and installation, Air Pro has all the knowledge, tools, and skills to install a complete heating system in any home or office.

Air Pro specializes in forced air ducted heating systems as well as ductless air conditioners and heat pumps.

Ducted heating systems installed by Air Pro include high-efficiency gas furnaces, electric furnaces, and both air source heat pumps and water source heat pumps.

The choices for energy sources to heat Southern Idaho homes and offices are natural gas, propane, electricity, or oil.

With oil prices such as they are oil heating has fallen out of favor with most people.

High efficiency gas furnaces are the most popular heating systems Air Pro installs. However some locations in the Treasure Valley do not have access to a natural gas source.

ELECTRIC HEATING

Electricity is the second most popular energy source used for heating.  A forced air electric furnace uses resistance heaters (like your toaster) that are combined with a blower (air handler) and a duct system to move the heat produced by the resistance heaters throughout the conditioned space. For every $1.00 spent on electricity to produce electric resistance heat S1.00 worth of heat is produced.

 

HEAT PUMPS

A heat pump delivers $3.00 to $4.00 worth of heat for every $1.00 spent on electricity.  Three times more efficient than electric resistance heaters!  How? A heat pump is basically an air conditioner working in reverse. Remember heat transfer, hot to cold.  A heat pump uses a compressor and a refrigeration circuit to cool the outdoor, evaporator, coil well below the outdoor temperature and extract heat from outdoor air (air source) or heat from well water (water source). The heat pump transfers the heat it picks up at its source (outdoor air or well water) and delivers the heat to your duct system efficiently heating your home or office.

AIR SOURCE HEAT PUMPS

Air source heat pumps are limited by outdoor air temperature.  The colder it gets outside the less heat is available to transfer to the conditioned space, your home or office. Most air source heat pumps in the Treasure Valley are sized for the cooling load and need assistance from electric resistance heaters or a gas furnace (hybrid system) when the outdoor temperature drops below 25 degrees or so.  As an air source heat pump runs in cold weather, the even colder outdoor coil collects moisture from the outdoor air which causes a frost to form on the outdoor coil.  All air source heat pumps need to go through a defrost cycle to clear the outdoor coil of frost and allow outdoor air flow across the outdoor coil for proper heat transfer to take place.

WATER SOURCE HEAT PUMPS

Water source heat pumps also know as ground source or geothermal heat pumps can be open loop (pulling water from a well transferring heat and discharging the same water into another well or pond) or closed loop (glycol solution inside buried underground tubing that transfers heat with the earth).

In Southern Idaho water source heat pumps usually draw heat from well water that is constantly 45 to 55 degrees.(like an air source heat pump heating on a 50 degree day!)  However with well water as a heat source the $3.00 to $4.00 worth of heat delivered for every $1.00 spent on electricity stays constant!  Water source heat pumps rarely need to use electric resistance heat as a back up heat source.  Most electric resistance heaters installed with a water source heat pump are installed as an emergency back up in the event that the water source heat pump itself should break down.

GAS FURNACES

Gas furnaces are by far the most popular source for heating in Boise and throughout the Treasure Valley.

A gas forced air system utilizes a gas furnace and duct system to deliver heat to homes and offices.

A basic gas furnace consists of a gas burners, heat exchanger, and blower.

The heat exchanger is a hallow metal shell that has chambers inside it near the bottom where the gas burners are positioned and a vent connection at the top to vent exhaust gases.

When gas is burnt at the burners the heat exchanger is heated from the inside. Airflow, forced by the blower, passes across the outside of the metal heat exchanger and transfers heat into your duct system to be distributed throughout the conditioned space.

The warm air that is created by the “exchange” is blown out the supply air ducts and is pulled back to the furnace from the conditioned space through the return air ducts.

This heating cycle continues until the wall thermostat is satisfied and shuts the burners off.  A cool down period with the furnace blower running follows to allow the heat exchanger to slowly cool and transfer as much heat from its metal shell as possible.

 

Air Pro Heating & Air Conditioning installs forced air gas and electric ducted heating systems, heat pump systems, and ductless heat pump systems. If you are in the market for a heating system installation to replace your old system, for your new home or office, or just need repairs or service on your existing furnace or heat pump.

Make Air Pro your first call! 208-853-6556