Type: Posts; User: dan sw fl
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It all depends on the THERMAL BALANCE POINT.
Heat Pump Size and performance versus the home heat losses in the range of 24'F to 38'F
will determine when the AUX Heat Strips will be operating.
ASHRAE 62.2 -2013
Run 50 CFM about half the time.
... ... WHEN YOU ARE HOME.
Q.AIR = CFM * DT * 1.08
... ... ---...
Why are you really concerned about a furnace that you never used?
A contractor, just like any salesperson, would probably tell you that
your savings are going to be more than one is CURRENTLY...
It starts with finding the HDD _Annual, Monthly & Daily -for the locale.
... Use the appropriate Equipment and system Efficiency.
70% < Efficiency <96%
There are upto 25 parameters I use to...
I would N E V E R endorse the use of a 100 % FLEXible Duct plan.
Zoning is not addressed in the duct plan.
I am sure that the duct layout does not deserve the attribute of ... A PLAN.
I don't know, trying to EXTRAPOLATE is not something I ever do.
However, it seems that with the EXISTING MARGIN, the 40,000 BTU/HR furnace would be adequate.
CLOSING VENTS reduces air flow, so...
AFTER installation of an appropriate Heat Pump System with Multiple Indoor units,
The savings from windows replacements from U-Value of 0.5 to 0.28,
you should expect a $120 / year savings.
$0.0797 per kWh for first 1,350 kWh in an average two month billing period (22.19 kWh per day)
$0.1195 per kWh over the...
A MULTI SPLIT UNIT will do the job for a 2,740 sq foot residence.
$2,780 per year FOR HEATING will be about $690.
due to the COP and significant difference in BC HYDRO electric rates for >...
NO ONE SAYS THAT INITIAL COST WOULD NOT BE A SIGNIFICANT $1#,### HURDLE.
THAT consumption is about 4 times the U.S. average.
Is your HEATING use about 1/2 of the TOTAL electric bill?
How old is the house?
Describe the heating equipment.
1700 sq feet .. Even in Chicago, probably only needs 42,000 BTU/HR when it is < 10'F outside.
Age of house?
# of windows?
With use of 75% efficiency for existing furnace,
the heat loss is 31,000 BTU/HR
for the 29-day billing period ending 3/6/15
Given a NEW furnace Efficiency of 95%.
there is significant...
Heating Degree Days (HDD) is from my ASHRAE Fundamentals Handbook or one of the several Weather Data services on the internet.
THERMS used in...
$ / Therm & bill$ or provide Therms used for EACH Month the last winter or two.
What is the age or efficiency of the existing furnace?
I suspect that the maximum heat loss is actually <...
Do they MEET YOUR SPECIFICATIONS?
... ... ... ALMOST THERE.!
_ Don't Throw that Access Door Away. -!.!!!
I very seriously doubt that anyone (excluding Polar Bears as a tenant) would have a window much more than "slightly open" when it's < 25'F out.
I would definitely get a 40,000 BTU/HR furnace to...
Using _ LOAD CALC _ with R-4 value for Floor and Walls
with AVERAGE used for INFILTRATION.
... 35,200 BTU/HR
Given your VERY LOW heating bills, I would suggest at this time that 40,000 BTU/HR...
Actual Heat Loss of 23,452 is NOT accurate.
Ceiling heat loss = 0.
No area was entered.
Total glass area appears to be 163 Sq.Ft. Windows
_____________________ ___ _ 48 Sq. Ft. Patio...
It means you have 50% overcapacity at 12'F.
97,000 Furnace output versus 65,000 Heat Loss
Validated with use of $350 / month at $0.90 / therm
and existing furnace Efficiency at 80%.
I canNot see your Load Calc.
Double pane windows ?
Total glass area?
How much natural gas do you use in a season?
CINCINNATI MUNICIPAL AP LUNKI
ASHRAE - 2009 EDITION
.... 6.3'F ________ 99.6%
12.4'F ________ 99.0%
.. 92.8'F / 74.9'F _ 0.4%
90.2'F / 74.4'F _ 1.0%
IF they ACTUALLY 'Checked the DUCTWORK performance' you would have a report that states
air flow required per room, the Actual Delivered air flow PER ROOM
and The DIFFERENCE.
This would have...
I would use a 4 or 5 ton two-stage with whole house dehumidifier UltraAire 105 or similar.
Duct work for Zoned system IS NOT the...
HEATING SEASON COST
1500 SQ.FT. with 500 Square Foot Basement
2012 ... IECC $550 with 96% furnace
1980 -Generic-~ $980 with 80% furnace
What is a reasonable cost to heat a 1500 square foot home in Colorado (and 500 sqft finished basement) ?
Depends on the age of the house and the cost of Natural Gas and Electricity
I doubt it ... Glass and basement heat loss loads apparently are More than I would calculate.
No, it is Not Identical.
Some companies wish to be broader based and include either plumbing and/or electrical.
HVAC - Heating,Ventilation and Air Conditioning
How much help might you be able to receive for your situation?
One cannot share a Load Calc that they Don't Actually have.
Do you have adequate ceiling insulation or are the attic joists exposed now?
With sealing of the ducts and use of R-8,
the heat loss/gain would be reduced significantly.
What is the total Existing air flow?
What is thee Existing air flow to downstairs?
Room Temperature ?
What is the Supply Air temperature at (*very close to) the coil ?
If the operating cost savings of a geothermal unit over an Air Source Heat Pump
is say, $ 360, then one might anticipate the payback period
... ... ... ... ... ... \\\ could be in the range of...
The contractor did NOT do AN EXCELLENT OPERATING Cost Analysis.
From Post # 1 - Total Loss 29,058
Option 2: 3 Ton 2 stage TE-038 closed ground loop with backup 5KW...
Two 4 kW heat strips
... ... ... ...
Solar PV - 5kW
EACH PRODUCT SERIES has Extended Performance Data
Combinations with SEER Ratings are provided the same as AHRI...
Do you actually need a furnace in Charlotte N.C.?
25'F Design Temperature
3,080 Heating Degree Days is a prime region for use of a Heat Pump.
1,670 Cooling Degree Days
They are Not NEW to the boiler industry.
I doubt any appliances have public data that supports Reliability claims.
A low cost Warranty ought to indicate that claims are very infrequent.
I would use a 4-ton, 5 speed heat pump and
a 60,000 BTU/HR high efficiency furnace with cut-in at 40'F
CARRIER model 25VNA8
Electric rate $0.105 / kw-hr
Natural Gas rate $1.22 / Therm...
Post # 2 x 2
A Controls issue is not going to be discovered ' over thee internet'.
WHERE IS PORTLAND?
$1,730 for COOLING SEASON ... 2,990 Cooling Degree Days ... 10 SEER
Need 6 tons using Sensible Ratio (S.H.R.) of 0.72 and
based on 550 square feet of glass & 260 CFM...
We're in Columbus, OH.
House was built in 1989,
and is about 2500 sq ft.
It's a 2-story with vaulted/cathedral ceilings, and a unfinished walk-out basement.
The basement would probably add...
The elevation won't make much difference, whether it's 4,000 or 6,000 feet, if it uses 5,285 feet