Carney All Seasons Blog: Archive for the ‘Heating’ Category

What is a Gas Furnace Draft Hood?

Monday, December 5th, 2011

As any Maple Glen heating 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 professional heating contractor 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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How a Furnace Works

Wednesday, November 23rd, 2011

Do you know how your furnace works? Believe it or not, lots of Harleysville homeowners probably can’t explain the operation of furnace. It probably isn’t at the top of your “to do” list. It’s only important to know that once you set your thermostat to a desired temperature, the furnace comes on and warms the house.

The most common furnace is fueled by natural gas but there are other examples of heating equipment such as boilers, electric baseboard, or geothermal. But let’s look at how a gas furnace works since natural gas is found in most U.S. households. Gas furnaces use natural gas or propane to provide energy used for generating heat.

When the temperature in your home falls below the level set on the thermostat, an electric pilot light automatically ignites to heat a burner inside the furnace. This burner uses gas to generate heat within a combustion chamber inside the furnace. After the furnace senses that the thermostat has triggered the flame and that it is properly lit, the actual spark (or ignitor) is turned off.

Simultaneously, a motor in the furnace pulls in air from an exchange or return, which could be a grill in the floor, ceiling, or wall of a house. That air flows through ducts into the plenum of the furnace. The plenum is on the opposite side of the heat exchanger from the burner.

Gas will typically burn for at least two minutes before the blower starts to disperse heat throughout your home. This extra time gives the air an adequate period of time to warm up and also so that cold air won’t be pushed through the vents into the rooms in your house at the start. After either the preset time (roughly two minutes) or pre-established temperature is reached, the blower’s motor is turned on and it blows air over the heat exchanger, which usually consists of a series of copper tubes or pipes. When a fan blows air onto the heat exchanger, the air is heated. This heated air is then blown through a series of ducts to heat your home via vents in the floor, walls or ceiling. Exhaust fumes from the combustion process exit the furnace through a gas flue or chimney.

Just as the heat in your home turns on when a certain temperature is reached, it also turns off after the rooms are warm enough, thanks to your thermostat. The thermostat again senses the temperature in the room. When the room warms up to the temperature set by you at the thermostat, the gas valve is switched off, stopping the flow of gas. After the gas is turned off, the blower motor will still run for a few minutes, allowing the heat exchanger to cool off a bit. In some furnaces, the blower motor never shuts off, but operates at low speed to keep air circulating throughout your home.

In a nutshell, your thermostat is the brain in your heating system and your furnace is the brawn, doing most of the work.

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Testimonial – Lee & Susan in Elkins Park

Monday, November 21st, 2011

With winter well on its way, don’t hesitate to call Carney Plumbing, Heating & Cooling if you need a new heating system. Lee & Susan from Elkins Park recently had their system replaced and here is what they wrote to us about the experience:

“From our very first contact via email, I was so impressed by Carney’s responsiveness and attentiveness to detail. Don [our Comfort Advisor] was the consummate professional. He worked meticulously with us to understand our unique situation. He then marshaled exactly the right resources to solve our plumbing emergency and our urgent need for a totally new heating system. I can’t thank him enough. Kevin L. [our plumbing technician] and his team worked with incredible skill and determination to resolve a complex plumbing problem. Jimmy, Rich and their [HVAC install] crew did a phenomenal job of installing our new HVAC system, leaving our home each day as clean as when they arrived.”

– Lee & Susan H., Elkins Park PA

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Why is My Furnace Turning On and Off?

Friday, November 18th, 2011

One of the most annoying things your furnace can do is to constantly keep turning on and off. This on-off cycling keeps your Yardley home from heating up properly. This action – called short cycling – also requires more electricity and drives up utility bills.

Short cycling is caused by an overheated furnace, which triggers safety mechanisms and shuts down the furnace. After a brief interval and cooling down, the furnace starts up again the cycle keeps repeating itself. Not only is it an annoyance, it can also signal more serious problems. A leaking heat exchanger can cause a furnace to overheat – and produce deadly carbon monoxide gas.

If a furnace is working too hard and overheating, it is usually because of airflow in and out. Your home’s ventilation system needs to be clear of dirt, dust, and debris. The more blockage in your ductwork and vents, the more friction is created, slowing down airflow and ultimately ending with an overworked furnace that continues to cycle on and off. And a blocked exhaust vent, such as a chimney or dedicated exhaust vent, can also cause a furnace to work harder. Check for things like leaves or bird’s nests.

The blockage may also be coming from a clogged furnace filter. You should clean or replace your furnace filter after a visual inspection reveals any type of build-up of dust or dirt. Do this at least every three-six months.

If you have a two-speed fan on your furnace, it is recommended that you run the fan in low speed during the cold months and high speed in the warm months. The reason? Warm air is lighter and takes less force to move.

There are other measures to take to prevent short cycling but these usually require a professional heating and cooling service technician to correct the problem. If in doubt, call your local qualified heating and cooling contractor and schedule a furnace inspection. Don’t make your furnace work any harder than it was designed for – and keep your home’s occupants comfortable and safe.

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Make Your Heating System More Energy Efficient

Wednesday, November 16th, 2011

Efficiency is what you want when it comes to heating your Abington home. You want a furnace that provides the greatest degree of accurate indoor comfort while at the same time operating at peak efficiency to reduce energy usage and lower utility bills. That’s seems like a lot to ask of a simple mechanical system but you should expect it out of the furnace in your basement, attic, or mechanical room.

It is especially important today as energy costs have steadily increased, including electricity, natural and propane gas, and oil. The best way to combat rising prices is to have a furnace that uses less energy. It is a simple statement but one that bears repeating: higher efficiency equals lower operating costs.

Here are some ways to make your heating system more energy efficient:

  1. Clean or replace furnace filters on a regular basis. A dirty or clogged filter will make your furnace work harder and become much less energy efficient. Monthly or quarterly cleaning or replacements are easy to do and will result greater operating efficiencies.
  2. Inspect your home’s ventilation system for accumulation of dirt, dust, or debris. Have you recently added new carpeting? Do your pets shed? Is there a large number of people living in your home? If you answered yes to any of these questions you may need to inspect your ventilation system.
  3. Remove obstructions from around vents and grilles. You need a clean path for air to flow into and out of rooms. Restricted airflow makes your furnace work harder and become less energy efficient.
  4. Consider an upgrade to a two-speed or variable speed furnace. Most older furnaces operated on one speed, which cycled on and off and consumed a lot of energy. Today’s furnaces operate at lower speeds, consuming less energy and often remaining on to keep a steady airflow and prevent constant on and off cycling. These newer furnaces are much more energy efficient and cost less to operate.
  5. Adhere to a regular schedule of planned furnace maintenance. If you don’t clean and inspect your furnace on a regular basis, schedule service calls with a local qualified heating contractor. Your contractor will likely have a service agreement plan to fit your budget, which allows for annual inspections, priority emergency service calls, and discounts on parts and services.

Besides saving on energy costs, your efficient furnace will leave a smaller “carbon footprint.” Your efficient furnace will exhaust less carbon dioxide into the atmosphere and maintain a more “green” profile. And being ecologically friendly can be just as important as saving money.

You can be assured that an energy efficient heating system will keep more money in your pocket this fall and winter.

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The Hardest HVAC Maintenance: Some Pointers from Sellersville

Monday, November 14th, 2011

Do you hate to work on your own mechanical equipment in your Sellersville home, like furnaces and plumbing fixtures? You aren’t alone. Many people are not cut out to be do-it-yourselfers (DIYers). They prefer to hand off their maintenance and repair chores to qualified professional. That’s not a bad thing. But there are lots of DIYers who prefer to work on their own home repairs – and those are the people who aren’t afraid to take on the most challenging jobs.

If you are looking for good ideas on how to maintain your home’s heating and cooling (HVAC) system beyond the normal filter changeouts, here are some good things to check – things that will help with the overall performance of your HVAC system.

  1. Check the ventilation system. The ventilation carries conditioned air from a main source throughout your home.  It takes a little time and effort to check your ventilation system for things like cracks or leaks around joints, but it is an important maintenance task. You may even find separations between joints or holes caused by nails. A leaky ventilation system could be sending conditioned air into attics, walls, or crawlspaces and making your furnace work extra hard just to keep your living areas warm and comfortable. Take time to visually inspect as much of your ventilation system as possible – usually metal or flex duct – and repair using joint glue, metal filler, or duct tape.
  2. Inspect the insulation. Your heating system works in conjunction with the insulation in your home to provide comfort and warmth while saving you on high utility bills. A home that is poorly insulated or not insulated at all will cause a furnace to work harder and not only send utility bills higher, but increase the possibility of mechanical failure. Replacing or adding insulation in walls and crawlspaces is a relatively easy, yet time-consuming task. You can roll down or tack up fiber insulation or blow in insulation into walls. You can also seal up cracks on your home’s walls, roof, or foundation with a number of different products. Once again, your goal is to make your heating system work less and save you money.
  3. Check the visible components of the furnace. A build-up of dust and dirt can make the moving components of your furnace work even harder, such as the motors, fan belts, contactors, etc. If you live in an area where there is lots of dust and humidity or if your home has several occupants and/or animals, it is particularly important to check your system on a regular basis. This can be done by removing the access panels and taking a vacuum cleaner hose into as many areas as possible. A good, thorough vacuuming should produce immediate results and make your furnace run much more efficiently.

Try these three steps and you may not have to repeat them for another year or so – possibly not ever again while you live in your home.

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Five Important HVAC Maintenance Tips

Friday, November 11th, 2011

Do you have a “mental checklist” of chores that need to be done a regular basis around your Solebury home, such as cleaning the window treatments, washing windows, shampooing rugs, etc.? There are various areas of your home that need regular maintenance and cleaning – and that list includes your heating and cooling (HVAC) equipment. Do you know a poorly operating furnace can cost you in increased energy usage and higher utility bills? That same poorly operating furnace can be discharging harmful carbon monoxide gas into your home, creating a health risk.

So, it is important to keep your furnace in peak operating condition and the best way to do that is by making a checklist of HVAC maintenance tasks. Let’s look at five of them.

  1. Check your filters. Routine replacement of your furnace filters should be every 1-3 months, depending on the indoor air quality of your home, number of occupants, size, etc. You can purchase disposable filters online, at a local “big box’ retailer, or from your local HVAC contractor. A visual inspection of your filter is the best way to determine if it needs replacing. If you have a removable electronic filter, it should be cleaned every few months using soapy water and a hose. Any restrictions to air flow through the filters can lead to poor indoor air quality and will cause your furnace to work even harder to circulate warm air through your duct system.
  2. Clean and insect the blower assembly and motor. You can do this with a vacuum. Also check the fan belt to make sure it is not too loose or if it has any cracks or splits.
  3. Look for any obstructions in vents and returns. Believe it or not, your furnace needs “help” to operate. Any build-up of dirt or debris around the grilles of your ventilation system will just make your furnace work a lot harder. Do a visual check inside and outside and pay special attention to flues and chimneys, where indoor air is exhausted. Any blockage can result in an accumulation of poisonous carbon monoxide gas.
  4. Keep the area clean and clear around your furnace and water heater. Never store flammable liquids near your heating equipment. Your furnace room is not a storage closet.
  5. Revisit your home’s insulation. When was the last time you checked out the insulation in your attic or crawlspace? Is it securely in place or drooping down? Are there bald spots where the insulation has deteriorated? Is the insulation sufficient or should it be upgrade?

Tips 1 and 2 relate directly to furnace maintenance but tips 3 to 5 are equally important, having a direct bearing on how your furnace performs and its ultimate efficiency. If you follow all five tips and have an annual inspection from a qualified HVAC contractor, you should enjoy a fall season of comfort, warmth, and safety.

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How Often Should I Replace My Furnace Filter?

Wednesday, November 9th, 2011

Just like the filter in your air conditioner, replacing your furnace filter is the key to a healthy and comfortable Willow Grove home. By keeping a good filter replacement schedule, you will reduce wear and tear to the furnace and keep your home warm, while keeping your family healthy and controlling energy costs all winter.

But when does your furnace filter need to be changed? Well, each system is different, but there are some general guidelines and recommendations to follow that can help you keep it all straight and stay on top of your furnace filter situation.

Conventional Wisdom

The long-standing rule of thumb on furnace filters is to change them every month. This is good practice if you are using older fiberglass filters, but for newer, more efficient filters, you should do it a little differently. These should be inspected and cleaned at least once a month, but you may need to replace them that frequently also.

Sometimes it is a little more complicated than these general guidelines, so it pays to be aware of some factors and conditions in your home that may affect how frequently you need to change your filter.

Things to Consider

As mentioned above, the first thing to consider is the efficiency of the filter. Because new filters are so efficient, when they get dirty or clogged with dust and debris, they actually restrict airflow, making your furnace bog down and work harder. So, it is important to stay on top of a monthly inspection and cleaning schedule with these filters.

Also take into account air quality and sources of allergens both inside and outside your home. If you live in an area with a lot of pollutants in the air, you’ll want to replace your filters often to keep those out of your home. If you own a lot of pets, the dander and hair will wind up in your furnace filter and you may have to replace it more often.

Complicated enough for you? It doesn’t have to be. Simplify the whole process by doing the following: check your filter monthly and be prepared to change it that often, clean high-efficiency filters regularly, replace the filter at least every three months and again at the start of heating season.

If you do those things at a minimum, you will be in pretty good shape. If have any questions about furnace maintenance, contact your local contractor.

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My Furnace isn’t Producing Enough Heat

Friday, November 4th, 2011

If your Telford home is cold, many blame the furnace for not bringing up the warm temperatures or they blame the thermostat for not working right.

It may very well be a thermostat issue – often caused by the location of the thermostat – that is causing the problem. However, sometimes root cause is found in the furnace or ventilation system.

Your indoor environment may be contributing to a seemingly slow-moving furnace. Your furnace may be working too hard to keep up with the heat demand because of an excessive build-up of dirt or debris on the filter or around the moving parts, such as the motor or fan belt. The most obvious thing to do is to keep the airflow unobstructed and keep all working parts clean.

First of all, you should regularly check your furnace filters and if they are dirty, replace them or clean them. Disposable furnace filters are relatively inexpensive and come in a variety of sizes and media ratings (ratings determine what size media is used and its ability to trap certain sized particulate). You can buy these individually or in bulk from a number of different resources. It is a good idea to replace the filters every three-six months.

Mesh filters can be removed, cleaned and reinserted. Like replaceable filters, mesh filters should be checked on a regular basis and then cleaned at least every three months.

You can remove the access panels to your furnace and inspect the components for any build-up of dust, dirt, or debris. Using a vacuum with an extension hose usually is all it takes to clean up the area.

Other reasons for poor heating performance include dirty or blocked ductwork. The harder your furnace has to work to push air through the ventilation system, the longer it takes to bring the heat up. Make your furnace work less and keep vents clear and ductwork clean.

Finally, the reason your furnace isn’t producing enough heat may not be the fault of your furnace at all – you may have a leaky house. But that’s a whole different story.

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Is Your Furnace Making too Much Noise?

Wednesday, November 2nd, 2011

The old saying that “It is better to be seen than heard” certainly applies to the mechanical equipment in your Ambler home. If you hear a squeaky noise or loud clattering you automatically suspect that something is wrong. And if that noise is coming from your furnace, you better pay attention to it. A noise is an obvious sign of a problem – minor or major – and it could result in mechanical failure that could leave your home cold and uncomfortable – and affect your home’s indoor air quality.

Today’s newer variable-speed furnaces keep a constant airflow through the ventilation system utilizing a low speed fan that consumes small amounts of electricity. Constant airflow brings in fresh air and keeps the room air from becoming stale or stagnant. Because of this constant operation, it is important to ensure the furnace is running at peak efficiency, which also means that it is running quietly.

Here are some common noises, possible reasons, and suggested repairs. As always, if you are in doubt about how to repair your furnace, call a local qualified heating contractor and schedule a service call.

  • Squealing noise – could be a worn out or slipping blower belt. Check for proper tension of the belt or replace the belt if it is worn out or cracked.
  • Squealing noise – could be worn out motor shaft bearings. Lubricate the blower motor at the proper points.
  • Rumbling noise – often caused by a poorly adjusted pilot light when the burners are turned off. Adjust the pilot as necessary.
  • Rumbling noise – often caused by dirty gas burners when the burners are switched on. This problem requires service from a qualified heating technician.
  • Buzzing noise – often caused when a blower motor mounting come loose. Tighten the mounting screws or use shims to fill gaps.
  • Hissing noise – indicates a possible air leak. This problem requires service from a qualified heating technician.
  • Ticking noise – possibly a leaky gas valve. This problem requires service from a qualified heating technician.
  • Rattling noise – could be a dirty fan blade. Wipe the fan blade or clean with degreaser.
  • Rattling, grinding, or whining – could be resistance to airflow that causes the motor to work harder. Check the vents in each room for dirt, debris, or obstructions and clear them.
  • Vibrating noise – may not be the furnace but loose or cracked seams in the ventilation system. Check the ductwork seams and hangers to ensure everything is tight. You may need duct tape or bracket hardware.

The best way to keep your furnace and ventilation system from making noises is to practice preventative maintenance. Have your furnace checked annually by a qualified heating contractor – and enjoy the peace and quiet.

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