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Call for reliable Furnace replacement in Springfield MO.
Don't Get Nervous ...(417) 866-1460
2145 W Sunset St. | Springfield, MO
Air Services Heating/Air Conditioning & All Services Plumbing has certified technicians to take care of your Furnace installation near Fremont MO.
Don't Get Nervous ...
(417) 866-1460
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How to Select a Residential Generator

Generators come in a variety of output sizes from 12 kW and higher. The best match will depend on the power (wattage) requirements of your home and the available fuel types. Some appliances with electric motors (refrigeration, air conditioners), require up to 2 to 3 times the listed wattage. The generator should be 20% larger than calculated requirements. Also, the additional capacity allows more circuits to be added for future use.

How much power do you need?

Generators produce AC voltage, very similar to the voltage available in your home.  However, while your electric utility company produces sufficient power for all of your electric powered devices, a home standby generator is limited in power output directly related to the engine horsepower. The amount of power that a generator can produce is rated in watts. Rated power is less than peak power as certain components lose efficiency when they are heated from use.

To calculate wattage requirements you should determine which devices need to be powered simultaneously and what are the starting requirements. A wattage chart is provided below to assist you. Remember that with simple "power management" techniques, a small generator can provide adequate power for your home or recreational applications.

The wattages listed below are based on estimated wattage requirements. For exact wattages, check the data plate or operator's manual of the item you wish to power.
Tool or Appliance
 Running Watts
 Starting Watts
 Ceiling Fan
 500  1200
 Central AC - 10,000 BTU*  1400  3000
 Central AC - 24,000 BTU*
 3800  4950
 Circular Saw - 7 1/4" 800   2300
 Clock Radio  100  -
 Clothes Dryer - Gas
 700  1200
 Coffee Maker
 1500  -
 Computer - 17" Monitor
 800  -
 Deep Freezer
 700  1000
 Dishwasher - Hot Dry
 1500  1500
 Electric Water Heater - 40 Gallon*
 4000  -
 Fax Machine
 65  -
 Furnace Fan
 800  1300
 Garage Door Opener
 750  1200
 Hair Dryer
 1250  -
 Hot Plate
 2100  -
 Inject Printer
 80  -
 Iron  1200  -
 Laser Printer
 950  -
 Microwave Oven-1000 Watt  1000  -
 Miter Saw - 10"  1650  2400
 Oscillating Fan  200  400
 Quartz Halogen Work Light  1000  -
 Reciprocating Saw 1200  2000
 Refrigerator/Freezer  700  1500
 Security System*  500  -
 Space heater  1800  -
 Stereo Receiver  450  -
 Sump Pump  800  1200
 Table Fan - 14"  200  400
 Television - 27"  500  -
Water Well Pump - 1/3 HP (220V)* 1000 2000
Window AC - 10,000 BTU 1200 2200
* These units are usually hard-wired and require a professionally installed transfer switch.

Additional Power Considerations

Some appliances need a "surge" of energy when starting. This means that the amount of electrical power needed to start the appliance may exceed the amount needed to maintain its use. Electrical appliances and tools normally come with a label indicating voltage, cycles/Hz, amperage (amps) and electrical power needed to run it. Check with your nearest dealer or service center for questions regarding power surges of certain appliances or power tools.
Electrical loads such as incandescent lamps and hot plates require the same wattage to start as is needed to maintain use.
Loads such as fluorescent lamps require 2 to 2 times the indicated wattage during start-up. Loads for mercury lamps require 2 to 3 times the indicated wattage during start-up.

Electrical motors require a large starting current. Power requirements depend on the type of motor and its use. Once enough "surge" is attained to start the motor, the appliance will require only 50% to 30% of the wattage to continue running.
Most electrical tools require 2 to 3 times their wattage for running under load during use. (For example, a 9,000 watt generator can power a 3,200 to 7,000 watt electrical tool.)
Loads such as submersible pumps, air conditioners and air compressors require a very large force to start. They need 3 to 5 times the normal running wattage in order to start. (For example, a 5,000 watt generator would only be able to drive a 1,800 to 3,100 watt pump.)

If the power consumption of electrical appliances exceeds the operating range or if there is short circuit or other problems in the appliances, the AC breaker could trip "OFF" or the rotation of the generator could be abnormally reduced. In this case, stop the generator to see if the power consumption of the appliances is too large and if there is a problem in the appliances.
What type of fuel is best?

This depends on many factors - shelf life, cost, storage location, availability, etc.



  • Long shelf life
  • Clean burning
  • Easily stored in both large tanks or in smaller 5-10 gallon cylinders
  • Obtainable during power outages - gas stations may be unable to pump other fuels during an area wide outage but, LP tanks are usually stocked full
  • Home delivery is usually available for larger tanks 


  • Pressurized cylinder of flammable gas
  • Fuel system is more complicated (increased possibility of failure)
  • Larger tanks are not aesthetically pleasing (unsightly)
  • Fuel systems plumbing results in higher installation cost
  • Some local ordinances prohibit the use of high pressure LP in residential applications


  • Usually unlimited fuel source - refueling not necessary
  • Clean burning
  • Almost always available during power outages- No unsightly tank required

  • May be unavailable during natural disasters (earthquakes, etc.)
  • Lower power output (30% less BTU's per unit than gasoline)
  • Larger tanks are not aesthetically pleasing (unsightly)
  • Fuel system plumbing results in higher installation cost
    Not available in many areas

  •  Least flammable fuel source
  • Clean burning
  • Easily obtained
  • On site fuel delivery available
  • High BTU output fuel



  • 18-24 month shelf life
  • Installing large storage tanks raises cost of system
  • May not be available during power outages
  • Unpleasant smell
Help Determining Your Home Standby Requirements

A homeowner should not attempt to specify and install a power system on their own.  We at Air Services stand ready to assist you in evaluating all of your options.
Don't Get Nervous...Call 417-866-1460 • or • Schedule Service Online
We service most Furnace brands and models near Springfield MO.
Business Address:
2145 W Sunset St.
Springfield, MO 65807
Contact Us
Schedule your Furnace replacement in Fremont MO.
Company Phone:
Phone: 417-866-1460
Fax: (417) 866-2407
We offer 24/7 emergency Furnace repair service in Springfield MO.
Office Hours:
Monday- Friday 8am-5pm
24 Hour Emergency Service
For your Furnace repair in Springfield MO, trust a licensed, certified contractor.
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