I hear all the time that furnace has 90% - 95% efficiency.

How is the efficiency of furnace counted? When it says 90 % efficiency, what's meant by that? 90 % measured against what? What's 100 %?

Thanks,

Jignesh

Views: 453

Replies are closed for this discussion.

Replies to This Discussion

Any of the various energy modeling programs would give you a starting place. Model the ducts in various places and with different insulation levels.   I know you will not forget to seal the ducts.

It is called the Distribution Efficiency Table. Here is a link to a PDF of it:

https://energy.mo.gov/sites/energy/files/bpi-distribution-efficienc...

Hope that helps

10-12" liners are not made. Biggest made I find is 6" Flue temp on gravity is above 800' most 80% gas or lp are in the 350-380'. If a low end replacement is put in goes from quite to very very noisy

For example: if a furnace has an AFUE rating of up to 98%, which means that up to 98 cents of every $1.00 of heating energy expense warms your home.

Before purchasing this appliance, read important information about its estimated annual energy consumption, yearly operating cost, or energy efficiency rating that is available from your retailer.

The efficiency of a furnace is the ratio of useful output to heat input. Even efficiency of the furnace can be determined by direct and indirect methods. The efficiency of the furnace can be computed by measuring the amount of fuel consumed per unit weight of material produced from the furnace.

Efficiency of furnace is calculated or measured by AFUE(Annual Fuel Utilization Efficiency).

AFUE is the ratio of annual heat output of the furnace or boiler compared to the total annual fossil fuel energy consumed by a furnace or boiler.

RSS

Latest Activity

Chris Stratton commented on Jim Gunshinan's blog post Our First Year with Solar Panels, by Chris Stratton
"@ Jonathan 1. Cost of PV array was about $15k before 30% federal tax credit. 2. The financial…"
1 hour ago
Chris Stratton commented on Jim Gunshinan's blog post Our First Year with Solar Panels, by Chris Stratton
"@ Brennan Hey thanks! Yeah, it's time for an update on the energy consumption now that…"
1 hour ago
Chris Stratton commented on Jim Gunshinan's blog post Our First Year with Solar Panels, by Chris Stratton
"@Grey re: estimated vs. actual production Good question! The estimated first-year annual production…"
1 hour ago
Diane Chojnowski's video was featured

People Who Save Energy 1: Builders

Millions of people work to save energy in the United States. They work in every state, across industries and technologies. To show the diverse arc of this growing workforce, we visited North Carolina. This video tells the stories of some of these…
3 hours ago
Jonathan Nadle commented on Jim Gunshinan's blog post Our First Year with Solar Panels, by Chris Stratton
"Hi Jim, Thanks for your well thought-out and written piece.  I agree with your comments on…"
20 hours ago
Leo Klisch commented on Jim Gunshinan's blog post Our First Year with Solar Panels, by Chris Stratton
"WOW! 913kwh/12= 76kwh/month. How is that possible? I live in central Minnesota and started with…"
20 hours ago
Leslie Jackson replied to Leslie Jackson's discussion DIY Filter Solution for an Evaporative Cooler, anyone?
"Thanks Rich, I hope they thought of that, but you are on to something. I think I learn more doing…"
23 hours ago
grey staples commented on Jim Gunshinan's blog post Our First Year with Solar Panels, by Chris Stratton
"Curious to know how the kWh production turned out relative to what the installer indicated you…"
yesterday
Brennan Less commented on Jim Gunshinan's blog post Our First Year with Solar Panels, by Chris Stratton
"Hey Chris, y'all are kicking butt!! I'm sure your new HVAC won't use any energy,…"
yesterday
Rich Manning replied to Leslie Jackson's discussion DIY Filter Solution for an Evaporative Cooler, anyone?
"Have them call a HVAC contractor and install a filter system"
yesterday
Rich Manning replied to Jerry Needham's discussion Condensation on ceiling and walls of master bedroom
"Looks like a leaking ridge vent"
yesterday
Jonathan Nadle liked Jim Gunshinan's blog post Our First Year with Solar Panels, by Chris Stratton
yesterday
Matt Peterson posted a blog post

Gas Line Installation In Portland OR Code Basics

When you're looking to undertake any kind of a remodel or repair in your home it's important to…See More
yesterday
Brennan Less liked Jim Gunshinan's blog post Our First Year with Solar Panels, by Chris Stratton
yesterday
Pearl Home Certification posted a blog post

Press Release: HomeSmart International Joins the Pearl Broker Advantage Program

Vienna, Virginia and Scottsdale, Arizona – July 19, 2018 – Pearl Certification and HomeSmart…See More
yesterday
Franco Oyuela commented on Allison A. Bailes III's blog post The Ductopus or the Centipede - Which HVAC Duct System Is Better?
"Many older homes were constructed without air ducts. Ductless systems can provide much needed air…"
yesterday
Franco Oyuela commented on Chris Laumer-Giddens's blog post The Ductless Mini-Split Heat Pump's Big Brother - CITY MULTI
"The compact design and long piping system gives homeowners free reign for designing a ductless…"
yesterday
Terry Hill's event was featured

Passive House Institute US 2018 Conference at Boston

September 19, 2018 at 6pm to September 23, 2018 at 7pm
Annual conferenceSee More
yesterday
Franco Oyuela commented on Allison A. Bailes III's blog post How the Heck Does a Heat Pump Get Heat from Cold?!
"Like conventional central heat pumps, ductless mini-split heat pumps manipulate refrigerant to move…"
yesterday
Leslie Jackson replied to Leslie Jackson's discussion DIY Filter Solution for an Evaporative Cooler, anyone?
"Thanks, Larry! You are probably not confused! Apply skin, not a Band-Aid ... or something like…"
yesterday

Photos

  • Add Photos
  • View All

© 2018   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service