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Furnaces

6 Cracked Heat Exchanger Symptoms: Tell Signs Of Bad Heat Exchanger

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A bad furnace heat exchanger is a nightmare. We many times forget that a heat exchanger is the biggest part of the furnace. It’s very understandable why everybody fears a cracked heat exchanger in a furnace. Here’s are two simple reasons why the issue of a cracked heat exchanger is so unnerving: Release of carbon … Read more

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Why Is My Furnace Leaking Water? (7 Issues + Fixes For Condensation)

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“My furnace is leaking water. Should I panic?” Finding water around your furnace is not ideal. Luckily, it’s also not tragic (in most cases). There are several reasons why the furnace is dripping water. The main culprit when you see water coming from a furnace is the damaged condensation drain. Here’s the deal: If you … Read more

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Why Is My Furnace Heater Blowing Cold Air? (7 Causes + Easy Fixes)

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The furnace heater is blowing cold air. That’s not how furnaces are supposed to work. What is wrong with your furnace? Before you call your HVAC guy, you can check for 7 reasons why your heater is blowing cold air yourself. According to the Consumer Affairs survey, more than 20% of homeowners (20.44%, to be … Read more

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Do Furnaces Have Pilot Lights? Which Ones Don’t? (Gas, Electric)

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To you a furnace, you have to run it first. You do that by using one of the furnace ignition methods. Since forever, all gas and electric furnaces had a pilot light ignition. That small blue flame. Today, not all furnaces have a pilot light. Why is that? Well, furnace technology evolves. So do furnace … Read more

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Cold Air Return Vents: What They Are, How Many Do You Need? (+Furnace)

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What is a cold air return vent? Simply put, a cold air vent returns cold air back into the furnace. No furnace can adequately operate without sufficient return air supply. We can think of a furnace as lungs. It ‘breaths out’ hot and it ‘inhales’ cold air. Air return vents are necessary for the ‘inhale’ … Read more

Categories Furnaces 17 Comments

AFUE Rating For Furnaces: How To Calculate AFUE Savings? (80 vs 94 AFUE Example)

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AFUE rating stands for ‘Annual Fuel Utilization Efficiency’. This is a key energy-efficiency rating for furnaces, and it’s most commonly used when evaluating the energy efficiency of gas furnaces. In the most basic sense, the AFUE rating tells us what percentage of fuel (natural gas, propane, oil) is converted into heat. Here are two examples … Read more

Categories Furnaces 6 Comments

Furnace Size Calculator: What Size Furnace Do I Need? (BTU Calculator)

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furnace sizing guide

How many BTU furnace do I need? Most homeowners have difficulties figuring out what size of furnace do they need. Fortunately, calculating furnace size (be it natural gas, propane, electric or oil) is not rocket science. To help future furnace owners out, we have developed a simple furnace sizing calculator. You only need to know … Read more

Categories Furnaces 36 Comments

Best High Efficiency Gas Furnace Brands, Costs (+ Installation)

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high efficiency gas furnace being installed by a hvac technician

Natural gas is the most common way to power a furnace. That’s why all major brands – from Carrier, Trane, American Standard to Lennox – are racing to create the best gas furnaces. That race is pretty much just about one thing: Energy-efficiency. Why? Well, the biggest selling point of gas furnaces is that they … Read more

Categories Furnaces 36 Comments

Best Oil Furnace Prices, Reviews, Efficiency (+ Installation Costs)

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several oil furnaces from different brands compared

A lot of people want to use heating oil as a viable heating option. The low cost of oil for oil furnaces is one of the main reasons why homeowners justifiably find oil as the best power-source for heating. However, there is just so much unknown about furnace prices and installation costs. For example, the … Read more

Categories Furnaces 18 Comments

Best Electric Furnace Brands, Cost, Efficiency (+ Installation)

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electrical installation of electric forced air furnace

The best furnace is the kind you don’t have to think or worry about. That’s exactly why electric furnaces are so popular. Convenience and safety are at the core of the best electric furnaces. Every home with access to electricity can safely install an electric heater for the winter season. The inner working of electric … Read more

Categories Furnaces 23 Comments
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Relevant HVAC Certificates:

energy efficiency guide

HVAC metrics:

SEER = (1 × EER100% + 42 × EER75% + 45 × EER50% + 12 × EER25%)/100

EER = BTUcooling/W

HSPF = BTUheating/W

COP = Q (useful heat)/W (input work)

ACH = CFM x 60/Area x Heightceiling

Total Heat (BTU/hr.) = 4.5 x CFM x Δh (std. air)

Sensible Heat (BTU/hr) = 1.1 x CFM x Δt (std. air)

Latent Heat (BTU/hr) = 0.69 x CFM x Δgr. (std. air)

1 HP = 746 Watts

1 kW = 3413 BTU

 

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