Barron Heating AC Electrical & Plumbing Blog: Archive for the ‘AFUE’ Category

Which is the BEST HVAC brand?

Wednesday, December 23rd, 2015

Government and utility consumer protection authorities unanimously agree that your satisfaction depends much more on picking the right contractor than a particular equipment brand.


One question we are asked time and time again is “What brand of furnace or air conditioner should I buy?”

Once a homeowner becomes more informed about the secrets of the HVAC industry, they always realize that the brand question is almost irrelevant.

Regardless of brand, today’s equipment is very well made. Modern air conditioners and furnaces are similar to modern televisions. It’s almost impossible to buy a bad TV nowadays. All the major brands make really excellent products that rarely break down. Like a TV, modern heating and cooling equipment is also very well made and dependable.

Unfortunately, the comparison stops there. When you buy a TV you can take it home, unpack it and plug it in. While a TV works right out of the box, a central air conditioner, heat pump or furnace must be very carefully selected and installed in order to work as the manufacturer intended. It can’t be just plugged in. Unfortunately for consumers, the installing contractor is the weak link in the chain.

A replacement HVAC system is NOT a plug-in appliance. It is much more like a home renovation project – which depends much more on the contractor than on the renovation materials used.

Government and utility consumer protection authorities unanimously agree that your satisfaction depends much more on picking the right contractor than a particular equipment brand. Energy Star says a good contractor:

  1. Will ask lots of questions about how the old system performed, and what you are hoping the new system will do.
  2. Will measure and inspect your home and recommend the right size system for your home.
  3. Will inspect or test your existing air duct system, explain the possible impact your old ducts will have on your new equipment, and provide upgrade options.
  4. Will explain multiple options for equipment efficiency, comfort and noise reduction features, warranty – and brand.
  5. Will install and commission your new system properly to best industry practices.

Buying a new heating and cooling system is a big investment – both upfront and long term due to utility and repair costs. Invest the time to become an informed consumer. Focus on the contractor and their business practices, not on the equipment brand or brands they happen to prefer and recommend.

If you are in the market for a new system, give us a call. We’d be happy to come out and chat about your needs, and explain how we follow the best industry practices so that you are 100% satisfied!

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Fixing Your Duct System Makes “Cents”

Wednesday, October 9th, 2013

In this article we are going to be discussing the EFFICIENCY MATH of purchasing a furnace and how duct sealing plays into your decisions.

Many customers start with the goal of “increasing their efficiency”, however, what they should be focusing on is “decreasing energy use”. In a lot of ways this is similar to the Government cutting spending or increasing taxes. For example, if there is a budget that needs to be met, they can either cut spending or increase taxes to meet it. Saving energy is like this in that if we need to lower your energy use we can either cut waste or increase efficiency.

The real kicker is that not one of us would buy a hybrid car and then run it on half inflated tires, but thousands of consumers make a similar decision every day when buying a heating system. Time and time again, they are told to increase the equipment efficiency without regard to whether the duct system is diminishing the total system efficiency through leaks to the outside.

It is a matter of simple math that no one ever explains, which scenario from below would you pick?

80% Furnace with Aeroseal Duct Sealing (Approx Cost $3500)

  • ($1.00 Given to Furnace) x (Furnace Efficiency of 80%)
    = $0.80 Delivered to Ducting
  • ($0.80 Delivered to Ducting) x (3% Duct Leakage After Aerosealing)
    = $0.776 Delivered Into the Home (Not bad…)

95% Furnace without Duct Sealing (Approx Cost $3500)

  • ($1.00 Given to Furnace) x (Furnace Efficiency of 95%)
    = $0.95 Delivered to Ducting
  • ($0.95 Delivered to Ducting) x (33% Average Duct Leakage)
    = $0.627 Delivered Into the Home (Ugh, that’s horrible.)

95% Furnace with Aeroseal Duct Sealing (Approx Cost $5000)

  • ($1.00 Given to Furnace) x (Furnace Efficiency of 95%)
    = $0.95 Delivered to Ducting
  • ($0.95 Delivered to Ducting) x (3% Duct Leakage After Aerosealing)
    = $0.922 Delivered Into the Home (Winning!)

The Moral of the story? It is important to buy the right things for the right reasons.

Posted by Wes Diskin

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Decoding Furnace Efficiencies

Thursday, August 22nd, 2013

A forced air furnace or boiler’s efficiency is measured by annual fuel utilization efficiency (AFUE). The Federal Trade Commission requires new furnaces or boilers to display their AFUE so consumers can compare heating efficiencies of various models. AFUE is a measure of how efficient the appliance is in the energy in its fuel over the course of a typical year.

Specifically, AFUE is the ratio of heat output of the furnace or boiler compared to the total energy consumed by a furnace or boiler. An AFUE of 90% means that 90% of the energy in the fuel becomes heat for the home and the other 10% escapes up the chimney and elsewhere. AFUE doesn’t include the heat losses of the duct system or piping, which can be as much as 35% of the energy for output of the furnace when ducts are located in the attic.

An all-electric furnace or boiler has no flue loss through a chimney. The AFUE rating for an all-electric furnace or boiler is between 95% and 100%. The lower values are for units installed outdoors because they have greater jacket heat loss. However, despite their high efficiency, the higher cost of electricity in most parts of the country makes all-electric furnaces or boilers an uneconomic choice. If you are interested in electric heating, consider installing a heat pump system.

The minimum allowed AFUE rating for a non-condensing fossil-fueled, warm-air furnace is 78%; the minimum rating for a fossil-fueled boiler is 80%; and the minimum rating for a gas-fueled steam boiler is 75%. A condensing furnace or boiler condenses the water vapor produced in the combustion process and uses the heat from this condensation. The AFUE rating for a condensing unit can be much higher (by more than 10 percentage points) than a non-condensing furnace. Although condensing units cost more than non-condensing units, the condensing unit can save you money in fuel costs over the 15- to 20-year life of the unit, and is a particularly wise investment in cold climates.

You can identify and compare a system’s efficiency by not only its AFUE but also by its equipment features, listed below.

Old, low-efficiency heating systems:

  • Natural draft that creates a flow of combustion gases
  • Continuous pilot light
  • Heavy heat exchanger
  • 68%–72% AFUE

Mid-efficiency heating systems:

  • Exhaust fan controls the flow of combustion air and combustion gases more precisely
  • Electronic ignition (no pilot light)
  • Compact size and lighter weight to reduce cycling losses
  • Small-diameter flue pipe
  • 80%–83% AFUE

High-efficiency heating systems:

  • Condensing flue gases in a second heat exchanger for extra efficiency
  • Sealed combustion
  • 90%–97% AFUE

Posted by Wes Diskin

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Understanding Efficiency Ratings of Furnaces

Thursday, July 18th, 2013

A central furnace or boiler’s efficiency is measured by annual fuel utilization efficiency (AFUE). The Federal Trade Commission requires new furnaces or boilers to display their AFUE so consumers can compare heating efficiencies of various models. AFUE is a measure of how efficient the appliance is in the energy in its fuel over the course of a typical year.

Specifically, AFUE is the ratio of heat output of the furnace or boiler compared to the total energy consumed by a furnace or boiler. An AFUE of 90% means that 90% of the energy in the fuel becomes heat for the home and the other 10% escapes up the chimney and elsewhere. AFUE doesn’t include the heat losses of the duct system or piping, which can be as much as 35% of the energy for output of the furnace when ducts are located in the attic.

An all-electric furnace or boiler has no flue loss through a chimney. The AFUE rating for an all-electric furnace or boiler is between 95% and 100%. The lower values are for units installed outdoors because they have greater jacket heat loss. However, despite their high efficiency, the higher cost of electricity in most parts of the country makes all-electric furnaces or boilers an uneconomic choice. If you are interested in electric heating, consider installing a heat pump system.

The minimum allowed AFUE rating for a non-condensing fossil-fueled, warm-air furnace is 78%; the minimum rating for a fossil-fueled boiler is 80%; and the minimum rating for a gas-fueled steam boiler is 75%. A condensing furnace or boiler condenses the water vapor produced in the combustion process and uses the heat from this condensation. The AFUE rating for a condensing unit can be much higher (by more than 10 percentage points) than a non-condensing furnace. Although condensing units cost more than non-condensing units, the condensing unit can save you money in fuel costs over the 15- to 20-year life of the unit, and is a particularly wise investment in cold climates.

You can identify and compare a system’s efficiency by not only its AFUE but also by its equipment features, listed below.

Old, low-efficiency heating systems:

  • Natural draft that creates a flow of combustion gases
  • Continuous pilot light
  • Heavy heat exchanger
  • 68%–72% AFUE

Mid-efficiency heating systems:

  • Exhaust fan controls the flow of combustion air and combustion gases more precisely
  • Electronic ignition (no pilot light)
  • Compact size and lighter weight to reduce cycling losses
  • Small-diameter flue pipe
  • 80%–83% AFUE

High-efficiency heating systems:

  • Condensing flue gases in a second heat exchanger for extra efficiency
  • Sealed combustion
  • 90%–97% AFUE

Posted by Wes Diskin

Continue Reading

Understanding Efficiency Ratings of Furnaces

Thursday, March 21st, 2013

A central furnace or boiler’s efficiency is measured by annual fuel utilization efficiency (AFUE). The Federal Trade Commission requires new furnaces or boilers to display their AFUE so consumers can compare heating efficiencies of various models. AFUE is a measure of how efficient the appliance is in the energy in its fuel over the course of a typical year.

Specifically, AFUE is the ratio of heat output of the furnace or boiler compared to the total energy consumed by a furnace or boiler. An AFUE of 90% means that 90% of the energy in the fuel becomes heat for the home and the other 10% escapes up the chimney and elsewhere. AFUE doesn’t include the heat losses of the duct system or piping, which can be as much as 35% of the energy for output of the furnace when ducts are located in the attic.

An all-electric furnace or boiler has no flue loss through a chimney. The AFUE rating for an all-electric furnace or boiler is between 95% and 100%. The lower values are for units installed outdoors because they have greater jacket heat loss. However, despite their high efficiency, the higher cost of electricity in most parts of the country makes all-electric furnaces or boilers an uneconomic choice. If you are interested in electric heating, consider installing a heat pump system.

The minimum allowed AFUE rating for a non-condensing fossil-fueled, warm-air furnace is 78%; the minimum rating for a fossil-fueled boiler is 80%; and the minimum rating for a gas-fueled steam boiler is 75%. A condensing furnace or boiler condenses the water vapor produced in the combustion process and uses the heat from this condensation. The AFUE rating for a condensing unit can be much higher (by more than 10 percentage points) than a non-condensing furnace. Although condensing units cost more than non-condensing units, the condensing unit can save you money in fuel costs over the 15- to 20-year life of the unit, and is a particularly wise investment in cold climates.

You can identify and compare a system’s efficiency by not only its AFUE but also by its equipment features, listed below.

Old, low-efficiency heating systems:

  • Natural draft that creates a flow of combustion gases
  • Continuous pilot light
  • Heavy heat exchanger
  • 68%–72% AFUE

Mid-efficiency heating systems:

  • Exhaust fan controls the flow of combustion air and combustion gases more precisely
  • Electronic ignition (no pilot light)
  • Compact size and lighter weight to reduce cycling losses
  • Small-diameter flue pipe
  • 80%–83% AFUE

High-efficiency heating systems:

  • Condensing flue gases in a second heat exchanger for extra efficiency
  • Sealed combustion
  • 90%–97% AFUE

Posted by Wes Diskin

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10 Buying Mistakes to Stay Away From – Helpful Hints for New Equipment

Thursday, February 28th, 2013

Every year millions of homeowners buy a new HVAC system for their home. Whether for heating, cooling or air quality, they make a huge investment in a new system that will be with them for years to come. Unfortunately, many of those people make big mistakes when buying their next system, so to help you avoid doing so, here are some simple things you should not do.

Ignoring Air Quality – Air quality is about more than comfort. It affects the health of everyone in your home equally. Consider it carefully when installing a new system.

Avoiding Even Heating and Cooling – One room being cooler or warmer than another is not okay. It’s bad for your system and bad for your home’s comfort level. Have insulation and ductwork checked before installation of a new HVAC system.

Not Upgrading Your AFUE or SEER – New systems are highly efficient. Take advantage of that by buying one with a higher AFUE or SEER rating.

Not Vetting Your Contractor – Always spend time checking up on your contractor, reading reviews and asking other customers how their experience was.

Skipping the Service Agreement – Service agreements save money and help your system last longer. Don’t skip them.

Buying the Cheapest Option Available – It may be tempting, but a cheap HVAC system is a bad idea if you want it to last and save you money in heating and cooling. Even a midrange system will save you money in only a few years with higher efficiency ratings.

Picking the Same Model You Already Had – New models are stronger and more efficient. When possible, get an upgrade and your bills will reflect the difference.

Waiting too Long to Buy – The longer you wait, the more you pay in heating and cooling bills for an old, worn down system. If you know you’re going to buy a new system, act fast to save the most possible money.

Not Asking Questions – If you have a question, ask it. There is no such thing as a stupid question when looking for a new HVAC system.

Ignoring Maintenance Recommendations – Maintenance recommendations are optional but almost always to your benefit. Research on your own before committing to anything, but don’t ignore the necessity either.

If you do things just right, your new HVAC system will last for years to come and provide steady, comfortable heating or cooling throughout that time. But, if you rush through things, make a hasty decision and neglect to do any research, you may have issues with your system in far less time than you’d like. Be smart and you’ll be rewarded.

Posted by Wes Diskin

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