EcoRenovator  

Go Back   EcoRenovator > Improvements > Conservation
Advanced Search
 


Blog Register 60+ Home Energy Saving Tips Recent Posts Search Today's Posts Mark Forums Read


Reply
 
Thread Tools Display Modes
Old 01-04-14, 03:05 PM   #101
Exeric
Apprentice EcoRenovator
 
Join Date: Aug 2012
Location: California
Posts: 274
Thanks: 19
Thanked 37 Times in 28 Posts
Default

Quote:
Originally Posted by AC_Hacker View Post
This is why Ground Source Heat Pumps were invented.

-AC
This is true. But your ROI has to include how many days there are in a year where really low temperatures exist. A lot of people use the principle of using the least expensive technology available that will cover 90 to 95 percent of their needs before going to a much more expensive technology that will cover 100 percent of their needs. I'm not one to decide which is best but I think both philosophies have merit.

How long you stay in your present house will enter into that equation.

Exeric is offline   Reply With Quote
Old 01-04-14, 03:21 PM   #102
Ormston
Apprentice EcoRenovator
 
Join Date: Mar 2013
Location: UK
Posts: 131
Thanks: 13
Thanked 35 Times in 32 Posts
Default

We currently don't have an inside thermostat, using weather compensation to adjust the buffer tank temperature for the UFH.
Whilst we aim for 20C (68) the house does fluctuate depending on solar gain and occupancy in a room.
House is heated 24/7 to the same temp by a tiny ASHP.
Ormston is offline   Reply With Quote
Old 01-04-14, 03:29 PM   #103
Xringer
Lex Parsimoniae
 
Xringer's Avatar
 
Join Date: Feb 2009
Location: Woburn, MA
Posts: 4,869
Thanks: 106
Thanked 244 Times in 224 Posts
Default

Quote:
Originally Posted by Exeric View Post
This is true. But your ROI has to include how many days there are in a year where really low temperatures exist. A lot of people use the principle of using the least expensive technology available that will cover 90 to 95 percent of their needs before going to a much more expensive technology that will cover 100 percent of their needs. I'm not one to decide which is best but I think both philosophies have merit.

How long you stay in your present house will enter into that equation.
Since I'll be 68 this month, I don't plan on living in this house more than another 10 or 15 years..

This is just a freak cold spell. Right now, temperatures are normal in Greenland.
Record Cold Temperatures Are Projected to Hit Much of the U.S. | TIME.com

While the U.S. as a whole has warmed by about 1.3 F (0.71 C)over the past 100 years, winter has seen the fastest warming. Winter nights across the country have warmed about 30% faster than nights over the whole year. Since 1912, the coldest states have warmed nearly twice as fast as the rest of the country. In a warming world, winter loses its sting.


This kind of cold snap should be a rarity, in the coming decades.
If my ASHP Sanyos wear out, I'll buy more of the same.
__________________
My hobby is installing & trying to repair mini-splits
EPA 608 Type 1 Technician Certification ~ 5 lbs or less..
Xringer is offline   Reply With Quote
Old 01-04-14, 05:15 PM   #104
AC_Hacker
Supreme EcoRenovator
 
AC_Hacker's Avatar
 
Join Date: Mar 2009
Location: Portland, OR
Posts: 4,002
Thanks: 303
Thanked 712 Times in 532 Posts
Default

Quote:
Originally Posted by Exeric View Post
... your ROI has to include how many days there are in a year where really low temperatures exist. A lot of people use the principle of using the least expensive technology available...
Sounds really sensible if you are in California right now and the weather is fairly pleasant.

Quote:
Originally Posted by Xringer View Post
...This kind of cold snap should be a rarity, in the coming decades. If my ASHP Sanyos wear out, I'll buy more of the same.
If you had three Sanyos, or maybe four Sanyos you might be able to ride out this foul streak with ease.

* * *

But the kind of weather you are now facing is the situation that Ground source Heat Pumps were made to handle well.


Twenty-five feet down in the ground, the temperature is around 47 degrees F, not -4 degrees F.

You may decide that the technology does not fit your budget, or that you'll never live long enough to pay it off... but physics will not be denied.

-AC
__________________
I'm not an HVAC technician. In fact, I'm barely even a hacker...
AC_Hacker is offline   Reply With Quote
Old 01-04-14, 05:17 PM   #105
Servicetech
Apprentice EcoRenovator
 
Servicetech's Avatar
 
Join Date: Nov 2013
Location: Moore Oklahoma
Posts: 267
Thanks: 108
Thanked 23 Times in 21 Posts
Default

The cost of digging for the ground loop is a BIG factor in determining payback time. If you do it when the house is built and the construction equipment is on site, the upfront expense isn't nearly as much as a retrofit install.
Servicetech is offline   Reply With Quote
Old 01-04-14, 06:04 PM   #106
Exeric
Apprentice EcoRenovator
 
Join Date: Aug 2012
Location: California
Posts: 274
Thanks: 19
Thanked 37 Times in 28 Posts
Default

Good point. If I had to dig the ground loop GSHP on a preexisting house as a retrofit in Mass I'd stick with Xringer's position. I'm 60 myself so I can identify with an ROI that may not be optimistic. I'm not the young buck AC is.
Exeric is offline   Reply With Quote
Old 01-04-14, 08:48 PM   #107
AC_Hacker
Supreme EcoRenovator
 
AC_Hacker's Avatar
 
Join Date: Mar 2009
Location: Portland, OR
Posts: 4,002
Thanks: 303
Thanked 712 Times in 532 Posts
Default

Quote:
Originally Posted by Exeric View Post
Good point. If I had to dig the ground loop GSHP on a preexisting house as a retrofit in Mass I'd stick with Xringer's position. I'm 60 myself so I can identify with an ROI that may not be optimistic. I'm not the young buck AC is.
Just because I'm 69 and I dug my loop field by hand doesn't mean I expect anyone else to get up out of their lounge chairs.

-AC
__________________
I'm not an HVAC technician. In fact, I'm barely even a hacker...
AC_Hacker is offline   Reply With Quote
Old 01-04-14, 09:44 PM   #108
Servicetech
Apprentice EcoRenovator
 
Servicetech's Avatar
 
Join Date: Nov 2013
Location: Moore Oklahoma
Posts: 267
Thanks: 108
Thanked 23 Times in 21 Posts
Default

Here's our schedule, it's been modified to 70 for wake and 55 for day.

Attached Thumbnails
Click image for larger version

Name:	IMG_20130322_191711_0.jpg
Views:	646
Size:	472.5 KB
ID:	3838  

Last edited by Daox; 01-05-14 at 10:12 AM..
Servicetech is offline   Reply With Quote
Old 01-05-14, 12:10 AM   #109
Xringer
Lex Parsimoniae
 
Xringer's Avatar
 
Join Date: Feb 2009
Location: Woburn, MA
Posts: 4,869
Thanks: 106
Thanked 244 Times in 224 Posts
Default

Quote:
Originally Posted by Exeric View Post
Good point. If I had to dig the ground loop GSHP on a preexisting house as a retrofit in Mass I'd stick with Xringer's position. I'm 60 myself so I can identify with an ROI that may not be optimistic. I'm not the young buck AC is.
I live on the north side of a 200 foot hill that's made out of solid rock.
The soil here isn't very thick, and it's fill with boulders the size of VW Beatles..

Digging anything over 8 or 10 feet deep is going to require explosives.
__________________
My hobby is installing & trying to repair mini-splits
EPA 608 Type 1 Technician Certification ~ 5 lbs or less..
Xringer is offline   Reply With Quote
Old 01-05-14, 09:11 AM   #110
poleikleng
Helper EcoRenovator
 
Join Date: Dec 2011
Location: Wrentham, MA
Posts: 30
Thanks: 0
Thanked 2 Times in 2 Posts
Default

We keep the temperature around 65 degrees, our 3-Fujitsu's air source heat pumps (two 1-ton units and one 1.5 ton unit) have been able to provide us with all of our heat. -3 degrees has been the coldest temperature that I have witnessed this month. We live close to Gillette stadium where the New England Patriots play their home games in Foxboro, Massachusetts.

Our upstairs heat pump is set to 60/62 degrees, downstairs we have two heat pumps (1-ton and 1.5 ton) and the 1.5 ton is set to 70 degrees and the 1-ton is set to 62/64 degrees. 1840 square foot cape style house built in the late 1970's.

poleikleng is offline   Reply With Quote
Reply


Tags
house temperature, winter

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 12:13 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Ad Management by RedTyger
Inactive Reminders By Icora Web Design