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  1. Replies
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    Try retscreen - they have weather tables for many...

    Try retscreen - they have weather tables for many locations and countries: http://www.retscreen.net/ang/home.php - you'll have to search around a bit but the tables are available. hot2000 (also from...
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    Only if the COP is higher at the lower rate -...

    Only if the COP is higher at the lower rate - otherwise there are no savings. Now the effective COP may be higher because the blower may be running more slowly in stage 1 and so the waste heat from...
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    You're getting confused between rate and volume....

    You're getting confused between rate and volume. Sure the "amp draw" is less, but the volume is lower too (i.e. output) so the system has to run longer. If you have to drive 100 miles you can do it...
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    How many residential compressors in the US use DC...

    How many residential compressors in the US use DC motors? I don't think there are any - even the inverter driven compressors are variable-frequency AC.

    Paul in Montreal.
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    Actually, it makes no difference to power...

    Actually, it makes no difference to power consumption since it is the thermostat (which is really dictated by the actual heat load required) which determines when to run the system or otherwise -...
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    The flaw in your reasoning here is that you're...

    The flaw in your reasoning here is that you're only considering the heat content of the air and have ignored the heat stored in the fabric of the building. To reduce the interior temperature by 1F...
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    814

    Depending on the brand of heatpump, there should...

    Depending on the brand of heatpump, there should be a jumper which [ a qualified technician] can set whether the pump should allow exiting water temperature below freezing. If you have antifreeze in...
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    Lots of posts in this thread. It may be worth...

    Lots of posts in this thread. It may be worth mentioning that the ARI ratings for geothermal closed loop heating are at an entering water temperature of 32F. Looking in the performance data from...
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    I managed to sell several on craigslist for a...

    I managed to sell several on craigslist for a total of half a G - and the guy came and hauled them away too! I was surprised how many bites I got. There is a local company that refurbishes them but...
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    Really? I live in Montreal and we do need A/C in...

    Really? I live in Montreal and we do need A/C in the summer when the hot humid air from the Gulf of Mexico heads our way. There are many days in the summer where the humidex is in the high 30s and...
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    I live in Montreal where the daytime temperatures...

    I live in Montreal where the daytime temperatures often go below 0F. I have a GSHP and it works fine at those temperatures. Like any HVAC system, a load calculation and proper sizing are required by...
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    Depends where you are in Canada. Here in Quebec...

    Depends where you are in Canada. Here in Quebec we used methanol/water mix on the two vertical loop systems we have - one is 420' and the other is 500'.

    Paul in Montreal.
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    You're right, we're not getting the full...

    You're right, we're not getting the full potential but at the time it was installed there wasn't space for the buffer tank (long story). Anyway, in winter, our gas consumption goes down to about...
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    We don't have a waterfurnace unit, it's...

    We don't have a waterfurnace unit, it's ClimateMaster. I didn't see anything in the manual about not using such a setup with gas hot water tanks. Anyway, it seems to work fine - the gas consumption...
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    I'm not sure what you mean here - what difference...

    I'm not sure what you mean here - what difference does the brand make to the required maintenance? For a closed loop system, the maintenance is minimal - nothing much more than changing the air...
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    Ground-level ozone is a bad thing and is a major...

    Ground-level ozone is a bad thing and is a major cause of smog and respiratory ailments. It does nothing to filter UV and is not a useful gas to have around. There's a well tested mechanism to...
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    Chlorine is a very reactive gas and quickly...

    Chlorine is a very reactive gas and quickly reacts after it has evaporated from the pool and hence never reaches the upper atmosphere where the ozone layer is.

    CFCs and HCFCs are very stable...
  19. It's a geothermal heatpump - there is no separate...

    It's a geothermal heatpump - there is no separate air handler - everything is in one unit.

    Before you power down, you could try shorting the two testpoints together - the LEDs on the board with...
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    You mention that your house is mainly old...

    You mention that your house is mainly old construction. I also live in a 110 year old house and it is made of solid stone, bricks, plaster and lath etc. and so has high thermal mass. This effectively...
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    We paid $14 a foot on one project and $17 a foot...

    We paid $14 a foot on one project and $17 a foot on another. Hitting the water table is probably a good thing as the heat transfer capacity of wet ground is better than dry.

    Paul.
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    we only have a 25' wide lot ... and were able to...

    we only have a 25' wide lot ... and were able to put in the vertical borehole for a GSHP without any problems
    http://www.mazspec.com/drilling.jpg

    So long as the drilling rig can get up your...
  23. I'm not sure what style it is considered. The...

    I'm not sure what style it is considered. The house was built in 1898


    We were lucky I guess in that no permit was required for the drilling - all I had to do was get an overnight parking pass...
  24. I live in Montreal and had a GSHP put in a house...

    I live in Montreal and had a GSHP put in a house on a very small lot - less than 25 feet from the house to the street. So instead of several holes, we did one deep one. This picture shows it can be...
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    Sounds like you're trying to do something similar...

    Sounds like you're trying to do something similar to a "passive" house. This concept is very popular in Europe, particularly Germany. You should consider shading techniques to reduce solar gain, use...
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