Polar Bear Air Conditioning & Heating Inc Blog : Archive for December, 2011

Happy New Year’s Eve from Your Washington DC Heating and Air Conditioning Contractor!

Saturday, December 31st, 2011

Happy New Years! We hope you have a great time tonight welcoming in the New Year and saying goodbye to the old. Forty-five percent of people make New Year’s resolutions; ours is to serve our customers even better than we did last year! If one of your resolutions is to make your home more green, remember that improving your insulation, sealing up any air leaks, and upgrading your HVAC system can have a big impact on your energy usage. A makeover for your house is great way to start off the year; it will make your home more comfortable and more environmentally friendly!

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A Question from Washington DC: What is a Gas Furnace Draft Hood?

Wednesday, December 28th, 2011

As every Washington DC heating and air conditioning contractor knows, a draft hood is a necessary part of any gas burning appliance. For a gas furnace in particular it ensures steady air flow to the burners to avoid flares or the pilot light being put out by fluctuation in temperature and air flow.

What the Draft Hood Does

The draft will change in the chimney as exhaust vents towards it – especially when going from cold air to hot. A draft hood is placed above the upper most part of the gas furnace to draw air into the chimney and makes it possible to draw more or less air through the chimney as necessary to create a constant flow.

This makes it possible for the burner to enjoy consistent air flow without any wind gusts or sudden temperature spikes or drops. Hot air, if not put through a draft hood would create a strong air flow through the burners.

A draft hood cools the air as it is released by the burners from 500 degrees F to between 300 degrees F and 350 degrees F. The cooling needs to be carefully calibrated to avoid condensation build up in the chimney however – a problem that occurs when the temperature gets too low.

Maintaining Pressure

The draft hood is a part of a larger system designed to maintain air flow to the chimney. For every cubic foot of gas burned, the furnace needs to have 15 cubic feet of air for combustion and another 15 cubic feet of air for dilution. A draft hood and the rest of the ventilation system make it possible to put a furnace that has many thousands of BTUs in the basement of your home and still supply it with enough air to burn gas and dilute the exhaust before it enters the chimney.

For all of these reasons, if you see your pilot light flickering irregularly, notice a backflow of exhaust or a burning smell in your furnace room, it’s important to call a Washington DC professional who can inspect and repair the problem before it becomes any worse. Not only can gas burner exhaust contain high levels of carbon monoxide, it can be bad for the device and the chimney if it doesn’t vent properly.

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Happy Holidays from Your Washington DC Heating and Air Conditioning Contractor!

Wednesday, December 21st, 2011

Everyone at Polar Bear Air Conditioning wishes you a very Happy Holiday! We hope you enjoy this time with friends, family and loved ones. Stay safe and warm this season! Also remember that whether you have a furnace, a heat pump, or a boiler, heating maintenance will keep your system running safely and at peak efficiency. If you haven’t had your annual checkup yet, we recommend you do so soon!

The holidays are a time to celebrate, and one of the best things about them is the great food. Here is a little treat we found that will make any day even better:

Gingersnap Cookies

“This melt-in-your-mouth ginger cookie recipe that I received from my grandmother has been enjoyed in my family since 1899.”

INGREDIENTS:

2 cups sifted all-purpose flour

1 tablespoon ground ginger

2 teaspoons baking soda

1 teaspoon ground cinnamon

1/2 teaspoon salt

3/4 cup shortening

1 cup white sugar

1 egg

1/4 cup dark molasses

1/3 cup cinnamon sugar

DIRECTIONS:

  1. Preheat oven to 350 degrees F (175 degrees C).
  2. Sift the flour, ginger, baking soda, cinnamon, and salt into a mixing bowl. Stir the mixture to blend evenly, and sift a second time into another bowl.
  3. Place the shortening into a mixing bowl and beat until creamy. Gradually beat in the white sugar. Beat in the egg, and dark molasses. Sift 1/3 of the flour mixture into the shortening mixture; stir to thoroughly blend. Sift in the remaining flour mixture, and mix together until a soft dough forms. Pinch off small amounts of dough and roll into 1 inch diameter balls between your hands. Roll each ball in cinnamon sugar, and place 2 inches apart on an ungreased baking sheet.
  4. Bake in preheated oven until the tops are rounded and slightly cracked, about 10 minutes. Cool cookies on a wire rack. Store in an air tight container.

For more details, visit allrecipes.com.

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Washington DC Heating Guide: Why Does Your Furnace’s Pilot Light Keep Going Off?

Wednesday, December 14th, 2011

If you have an older furnace with a gas pilot light and it keeps going out, heating your Washington DC home can become a frustrating process. Not only are you forced to trudge downstairs to light it every time you need heat, but you’re probably starting to worry that there is something wrong – either with your furnace or with your gas supply. Here are some possible reasons for your pilot light shutting off and what you can do about them.

  • Thermocouple – The thermocouple is used to generate electricity from the gas being burned by the pilot light to power the sensor that keeps the pilot light running. So, if the thermocouple goes bad or gets blocked in some way, the sensor won’t work properly and your pilot light won’t remain lit. Even a small problem with the thermocouple can lead to the valve closing and the pilot light going out.
  • Gas Pressure – If the gas pressure going to your furnace is too low, due to a leak, pipe problem or another appliance, the pilot light may not have enough gas to stay lit. While it is possible that the problem is not related to gas pressure, anything that affects the flow of gas into your home should be inspected by a professional. If you smell gas, leave the house and call your gas company immediately.
  • Mercury Sensor – The sensor in your pilot light that maintains the flow of gas to keep it lit can go bad. Keep in mind that these sensors almost always used to contain mercury (and often still do), so you should be careful with them. It’s best to call a professional who can replace and dispose of it properly.
  • Dirty Burners – Excess dust, lint, rust or sulfur build up can result in blockage of the burner holes. When this happens, gas will flood into the chamber but not light right away. When it does finally light, it will create a small boom or banging sound that will often put out the pilot light. Not only is this inconvenient, it is very dangerous. Fortunately, it can be avoided with annual cleanings of your furnace.

The best way to keep your pilot light lit at all times is to have someone inspect it once a year. If something happens in between, you can usually rule out cleanliness issues and call in a heating contractor to check the thermocouple and sensor.

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A Question from DC: What’s the Difference Between a Furnace and a Boiler?

Wednesday, December 7th, 2011

When it comes time to choose a new heating system for your DC home, there is a good chance your choices are limited. Most homes already have either forced air or radiant heat equipment installed so choosing something different would be costly and unnecessary. But, if you have a choice or are moving into a new home, here are some things to consider regarding the difference between furnaces and boilers.

What a Furnace Does

A furnace uses a fuel like gas, oil or electricity to heat a series of coils in the device. The furnace then uses a blower to push air across the heated coil and into an air handler where it can be distributed throughout your home. This is called a forced air system and requires a combination of ducts and filters to keep air moving smoothly and cleanly throughout your home.

If you have access to gas, a gas furnace with an AFUE of 90% or higher is one of the most efficient and cost effective ways to heat your home. These furnaces can also last upwards of 20-25 years with proper maintenance.

What a Boiler Does

A boiler is different in that it uses water as the heat carrying medium, not air. Boilers still need gas, oil or electricity to heat up the water in the system, though they often use less of it than a traditional furnace – depending on the age of the furnace and the boiler. After water is heated in the boiler, your radiant heating system carries the water to baseboard heaters or radiators throughout your home. This form of heat is preferred by many because it doesn’t require ductwork (which requires extra maintenance) or extra air filtering and it is more humidity friendly in a large home.

In terms of efficiency, both boilers and furnaces are efficient if you’re buying a new model. Capacity is also evenly matched. Boilers take the edge in comfort level and if you have the budget, you can install radiant floor heating which allows you to pipe hot water directly into bathroom floors or your living space so that you never again need to walk on cold floors. Another benefit of radiant heating is that the system will hold heat much longer and then release it over time instead of turning on and off a lot as a furnace tends to do.

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