Bob Blanchette
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  • Oklahoma City, OK
  • United States
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How does Cycles Per Hour affect real world AFUE?
2 Replies

Some claim that modern furnaces have minimized off cycle losses to the point they no longer matter. Oversizing has become a comfort issue rather than an efficiency issue. Is this really true? What…Continue

Tags: duct, cycles, CPH

Started this discussion. Last reply by tedkidd on Thursday.

Dual Fuel Systems, at what point do they make sense?
2 Replies

Heat Pump with furnace backup. These make no sense in our area with local NG rates, but they do make sense for LP. Our NG is cheap, but the meter fee is expensive ($30/mo). Makes more sense to either…Continue

Started this discussion. Last reply by Eric Kjelshus Dec 4.

Condenser placement effect on efficiency
3 Replies

Does locating an AC condenser out of the sun (east vs. west side of house) make significant difference in real world efficiency? Does anybody have a link to a case study?Continue

Started this discussion. Last reply by Bob Blanchette Jul 17.

Tankless Water Heaters... has their time finally come?
32 Replies

For decades tankless water heaters haven't been worth the effort to install due to our artificially low cost of natural gas in the USA and the high price of tankless heaters. Tankless water heaters…Continue

Started this discussion. Last reply by Dennis Heidner May 28.

 

Bob Blanchette's Page

Latest Activity

tedkidd replied to Bob Blanchette's discussion How does Cycles Per Hour affect real world AFUE?
"Want to spot a simpleton? It's a guy who thinks EE and comfort are disconnected.  Want to spot a thief? It's a guy justifying selling a larger furnace.  Cycling losses can be HUGE, because they are hard to measure they are…"
Thursday
Bob Blanchette's discussion was featured

How does Cycles Per Hour affect real world AFUE?

Some claim that modern furnaces have minimized off cycle losses to the point they no longer matter. Oversizing has become a comfort issue rather than an efficiency issue. Is this really true? What are the effects of the system cycling more frequently when it comes to ductwork losses in unconditioned space? Is it better to have 1 long cycle instead of 2 shorter ones? Some argue that modulating furnaces operate at a LOWER efficiency due to greater ductwork losses.See More
Thursday
Hal Skinner replied to Bob Blanchette's discussion How does Cycles Per Hour affect real world AFUE?
"Hi Bob, Many AC and heating contractors have tol;d me the same thing over the years;  If you can do ANYTHING that can cause a ubit to cycle on and off when it did not before, you just extended the life of that unit by 100%.   We were…"
Tuesday
Bob Blanchette posted a discussion

How does Cycles Per Hour affect real world AFUE?

Some claim that modern furnaces have minimized off cycle losses to the point they no longer matter. Oversizing has become a comfort issue rather than an efficiency issue. Is this really true? What are the effects of the system cycling more frequently when it comes to ductwork losses in unconditioned space? Is it better to have 1 long cycle instead of 2 shorter ones? Some argue that modulating furnaces operate at a LOWER efficiency due to greater ductwork losses.See More
Dec 14
Bob Blanchette commented on Evan Mills's blog post Welcome to Home Energy Pros!
"Try selling based on COMFORT instead of focusing on energy savings. Even temps throughout the house, eliminating chilly drafts, better quality of lighting. Consumers primarily want comfort, with energy savings as a secondary concern."
Dec 14
Bob Blanchette replied to Steve Waclo's discussion Floor level return added to attic ductwork. in the group HVAC
"Why use insulated flex if the return duct is in conditioned space? You could have used a 10" hard pipe, but you would have been limited by the 5x14 return anyway. My house is similar, 10' ceilings, 1999 construction, 150sqft less, slab…"
Dec 14
Bob Blanchette replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"In Germany you have economies of scale. They sell more so the cost is lower.In the USA we pay a large portion of our energy costs on April 15th with our income taxes. Government subsidies to energy companies artificially lower the cost of utility…"
Dec 12
Bob Blanchette replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"Germany pays 3X what we do per KWH."
Dec 12
Bob Blanchette replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"Sounds like a small point of use electric would be the most practical for them."
Dec 12
Bob Blanchette replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"Can you tell the houses with LED bulbs vs CFL or even Edison by looking at power bills? Are people chasing pennies in residential lighting?"
Dec 10
Bob Blanchette replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"A DTH of NG is an average of $10 on a national basis. 1KWH of electricity averages about 12 cents. There are 293KWH in a DTH. 293 x 12 cents = $35.16 for the same energy that NG provides for $10. Would you pull a NG furnace and replace it with…"
Dec 9
Bob Blanchette replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"Switching from gas to electric makes no sense unless it's part of a larger plan to go to an all electric home. Electric water heaters cost 3X as much to operate vs gas in most parts of the country. If you are going to pay the monthly gas meter…"
Dec 9
Bob Blanchette's discussion was featured

Dual Fuel Systems, at what point do they make sense?

Heat Pump with furnace backup. These make no sense in our area with local NG rates, but they do make sense for LP. Our NG is cheap, but the meter fee is expensive ($30/mo). Makes more sense to either go all electric home or just use the NG furnace.For those of you that live in areas where NG backup makes sense, what are your utility rates, including monthly customer charge/meter fees?See More
Dec 8
Bob Blanchette replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"Trading a .67EF water heater for a .82EF? 15% savings on water heating costs for an extra $1,000 or so installed cost? You have to use a LOT of hot water before saving enough in NG costs to pay for itself. Saving the space can be a good reason to…"
Dec 6
Bob Blanchette commented on Tom White's video
Thumbnail

Structured Plumbing: From Main-Branch to Main-Twig

"Watched the whole video, still doesn't explain how it works"
Dec 6
Eric Kjelshus replied to Bob Blanchette's discussion Dual Fuel Systems, at what point do they make sense?
"What is the brake even for a Heat pump vs nat gas 96%   its like 58'.    It's cost about $2000 more for heat pump than AC.  "
Dec 4

Profile Information

Company
Corix Utilities
Professional Interests
Smartgrid systems, HVAC.
Website URL
http://www.ogepet.com/programs/smarthours.aspx
Facebook Page
http://www.facebook.com/bob.blanchette.94

Bob Blanchette's Blog

Replaced my A/C this weekend, results of downsizing by 1/3.

Recently my 13 yr old Carrier A/C devolved a leak and I chose to replace the system rather than track down the leak and repair the coil. I had been reading about doing manual J calculations and how contractors are scared to death to undersize. I had been talking to co-workers about this and it's an uphill battle getting them to think different than 1 ton per 500sq ft. So I decided to take confidence in correct sizing and "put my money where my mouth is" and install a 2 ton sized…

Continue

Posted on September 2, 2012 at 4:39pm — 2 Comments

Just Signed up for OG&E Smarthours Program, A new way to manage energy use

How SmartHours Plus works: It costs more for electricity during peak periods of high customer demand.

Other factors, like weather conditions and the time of year, also drive electrical prices higher. SmartHours Plus,

sometimes known as Variable Peak Pricing (VPP), allows you to save when costs are lower, or off peak. Peak hours

are 2 to 7 p.m. weekdays, and prices during those hours vary based on demand (see chart). You’ll get advance

notice of tomorrow’s peak price the…

Continue

Posted on January 17, 2012 at 1:30pm

Comment Wall (2 comments)

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At 1:46pm on January 17, 2012, Diane Chojnowski said…

Hi Bob,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!

Thanks!
Diane, HEP Moderator

At 7:55am on January 14, 2012, Diane Chojnowski said…

Hi Bob,

 

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!

Don't forget to add your location on our Member Map. We'd be happy to see Sweden represented!


Thanks!
Diane, HEP Moderator

 
 
 

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The Future of Housing - And How Airtightness Can Help

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tedkidd replied to Bob Blanchette's discussion How does Cycles Per Hour affect real world AFUE?
"Want to spot a simpleton? It's a guy who thinks EE and comfort are disconnected.  Want…"
Thursday
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