Purl's Sheet Metal & Air Conditioning Blog: Posts Tagged ‘Gas Furnaces’

Why Pilots Lights Have Gone “Out of Fashion”

Monday, November 27th, 2023
natural-gas-burner

Once upon a time, when people discussed gas furnaces, they often talked about the pilot light. This flame burned through the winter in the furnace, ready to ignite the burners as soon as gas started to flow to them. Sometimes the pilot light would go out and need relighting—and this was often Troubleshooting Step #1 on lists of what to do if a gas furnace stopped working. 

But now the question people are asking isn’t “how to light a gas furnace in Fresno, CA” so much as wondering what happened to the pilot light. Some models may still use them, but not many. The pilot light has gone out of fashion, and for some good reasons.

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Sealed Combustion Furnace: What Makes It Different From a Standard Furnace?

Monday, October 16th, 2023
natural-gas-burner

How much do you know about the operation of your furnace? You may understand the basics of how a gas furnace runs: gas burners ignite, hot combustion gas collects inside the heat exchanger, the heat from the exchanger walls transfers to the air, and a blower pushes the air into the ventilation system. But there are some differences between furnace construction that can make a significant difference, such as whether your furnace is a sealed combustion furnace.

If you’ve never heard of the term sealed combustion furnace, we’re glad to explain to you what it is and why it’s different—and often superior—to a standard furnace. If you’re interested in sealed combustion heaters in Fresno as a choice for your home, we can assist you.

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Is Electronic Ignition Only for Electric Furnaces?

Monday, September 18th, 2023
natural-gas-burner

You may have heard about furnaces switching to something called electronic ignition. If you have a gas furnace, you might think this doesn’t apply to you—after all, wouldn’t electronic ignition only apply to electric furnaces?

The keyword you might be overlooking is ignition, which means igniting something. Electronic furnaces do not use any type of combustion or burning to work. Instead, they allow electric voltage to flow through a series of heating elements, which then warm up through electrical resistance. The only furnaces that use electronic ignition are the ones that burn natural gas (or less common options like propane or oil). 

If you’re curious about how this works and how to light a gas furnace with electronic ignition, we’ll explain below. We’ll also look at why electronic ignition is a beneficial change from standing pilot lights.

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What Does a Furnace Limit Switch Do?

Monday, November 28th, 2022
furnace-with-pipes

Gas furnaces work on a basic principle: lit gas flames heat air that is blown through the furnace and into the rooms through ductwork. But gas furnaces are complex devices that have several safety features and mechanisms that allow them to work correctly and without creating hazards. 

One of the key components for the operation of a furnace is the furnace limit switch. You don’t need to know all the details about this part, but understanding the basics will help you know more about how your furnace works—and why it sometimes doesn’t work.

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Why Won’t My Gas Furnace Turn On?

Monday, October 17th, 2022
inside-a-gas-furnace

This isn’t a situation you want to run into when the outdoor temperatures drop. A gas furnace not heating can happen for multiple reasons, some simple and easy to correct with troubleshooting, others that require calling professionals like ours to handle repairs.

We’re going to look at some of the common causes for a furnace that won’t turn on and provide heat to a home. Although we’ll point out situations where you can remedy the issue on your own, we want to stress that any actual repair must have a licensed expert. Tinkering with a gas furnace on your own can be extremely hazardous. When you have any doubts about your gas furnace, please reach out to us rather than attempt to solve it yourself.

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How Does Electronic Ignition Work in a Furnace?

Monday, January 24th, 2022
furnace-burners-CU

The natural gas furnace has been common in homes since the 1940s. Until fairly recently, these furnaces used a standing pilot light to ignite the gas burners at the start of their heating cycle. The pilot light would maintain a small flame throughout the heating season so whenever gas flowed to the burners, the pilot would immediately ignite them.

There are still furnaces in use today that have standing pilot lights, but they’re becoming rarer each year. Most natural gas furnaces have changed over to using electronic ignition systems instead. The reason for the change is to make furnaces more energy-efficient as well as more reliable. A pilot light that burns for the whole winter is an additional drain on natural gas, while an electronic ignition system only needs to use power at the moment it ignites the burners.

How does electronic ignition work? There are two general types of electronic ignition systems found in furnaces: hot surface ignition and intermittent pilots.

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Explaining AFUE Ratings for Gas Furnaces vs. Electric Furnaces

Monday, December 28th, 2020

natural-gas-burnerOne of the trickiest parts of navigating a new heating system installation for a house is figuring out energy efficiency ratings and what they mean. People want their heating systems to use less energy if possible, but they may not understand what the efficiency ratings mean and if it’s worth it to pay more to install a high-efficiency system.

Making the choice for a new central heating system is much easier when you have the assistance of our Madera, CA, HVAC experts. It’s our job to see you have the right heating system for your house, and we’ll assist you with figuring out efficiency ratings and all the other important factors that go into new system selection.

In this post, we’ll look at an example of where efficiency ratings can be confusing for homeowners, which is how the AFUE ratings for furnaces differ between gas and electric models.

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The Failed Furnace Control Board: A Major Furnace Problem

Tuesday, December 15th, 2020

electrical-schematicA natural gas furnace may burn gas to create the heat sent into the home, but the furnace also uses electrical power to run. This is why your furnace won’t work during a power outage, and also why you may need heater repair in Madera, CA to repair electrical components in your furnace at times. In fact, electrical malfunctions are among the more common type of furnace problems. We’re looking at one of these major malfunctions today, which is a failed furnace control board.

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Why Has My Gas Furnace Shut Down?

Tuesday, October 20th, 2020

furnace-isolated-whiteAs we move toward the end of the year, furnaces will begin to come to life all over the Central Valley, and they’ll remain working steadily through the winter and into spring. At least, we hope they work steadily. A furnace failure can put a family in a bad position. Fortunately, you can always call us for furnace repair in Fresno, CA and throughout the Central Valley and we’ll get your furnace back in shape.

Below we’re going to look at some of the reasons your gas furnace may have shut off. Many of these are minor problems that you can correct yourself. Not repair yourself, however. These are basic troubleshooting steps. Please don’t open the furnace panel and try to tinker around inside. You probably won’t be able to fix the problem yourself and it’s potentially dangerous to try. You must leave all service on a gas furnace to licensed professionals.

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Replacing Your Furnace? Here Are Great Features of Modern Gas Furnaces

Wednesday, March 13th, 2019

home-basement-furnaceSpring is a great time of the year to make significant changes to a home’s HVAC system. Between the extreme cold of winter and the extreme heat of summer is a mild period when a house won’t need either its heating system or AC running, and HVAC technicians have more open schedules for convenient appointments.

So if you think your old furnace is ready to retire, right now is the ideal time to call us for furnace service in Fresno, CA or elsewhere in the Central Valley to replace it.

If the furnace you’re replacing is more than 15 years old, we want you to know about the excellent features available with different modern furnaces. Heating technology is always advancing, and many current furnaces offer superb energy-saving and performance-improving features:

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