# Search:

Type: Posts; User: dan sw fl

Page 1 of 20 1

1. ## Thread: How long should AC run consistently

by dan sw fl
Replies
5
Views
224

### General Operatoin

If one keeps an A/C unit operating well
with a good maintenance program,
one may expect to see a life of upto 50,000 hours.

One certainly will not see anywhere near 1/2 of that life
when the...
2. ## Thread: Heatpump pipe sizing?

by dan sw fl
Replies
1
Views
87

### Page 4 or 5 See LINK ...

Page 4 or 5
See

http://www.americanstandardair.com/content/dam/Trane/Commercial/global/products-systems/equipment/unitary/split-systems/split-systems-1-1-2-to-5-tons/22-1890-01.pdf
3. ## Thread: Calculator for HSPF * \$ kwh = \$/mbtu??

by dan sw fl
Replies
14
Views
353

### ... You can only WISH electric rate was 2 cents....

... You can only WISH electric rate was 2 cents.

http://www.electricrate.com/residential-rates-massachusetts/
4. ## Thread: Why different speeds?

by dan sw fl
Replies
48
Views
1,775

### How old is the house? It must be SUPER...

How old is the house?

It must be SUPER INSULATED and Very Tight to be running only 30% of the time
when it is 105'F and maintaining < 77'F.!
5. ## Thread: Calculator for HSPF * \$ kwh = \$/mbtu??

by dan sw fl
Replies
14
Views
353

### C.O.P. for a general SEER / HSPF level can be...

C.O.P. for a general SEER / HSPF level can be used to establish
performance and cost estimates with Reasonable accuracy.

What is your particular situation and objective?

At > 30'F,
N.G. at...
6. ## Thread: Calculator for HSPF * \$ kwh = \$/mbtu??

by dan sw fl
Replies
14
Views
353

### \$8.80 / 73 kW-hr for 1,000,000 BTU at \$0.12 /...

\$8.80 / 73 kW-hr for 1,000,000 BTU at \$0.12 / Kw-Hr for > 40'F
about 13% - 18% more in the 30'F to 35'F range

... 4.0 - ___ Heat Pump C.O.P. for Toutside > 40'F
100,000 ___ BTU/ Therm ...
7. ## Thread: New AC system - MUCH higher electrical bill

by dan sw fl
Replies
92
Views
2,242

### Variable speed 4-ton downstairs would ramp down...

Variable speed 4-ton downstairs would ramp down to less than 2-tons
+ control humidity. Then you can turn the t-stat up to 76 or 77'F
with the same perceived comfort level.

I didn't say it...
8. ## Thread: 1.5 Ton Goodman Heat Pump- R22 Split system matched

by dan sw fl
Replies
51
Views
807

### - - Q = A * dT / R Loss with the duct using...

- - Q = A * dT / R

Loss with the duct using R 4 and 130'F for the rafter space temperature ..
Loss is about 18% of system sensible cooling capacity for a total of 5 duct that are 18 feet each....
9. ## Thread: Need help with finding proper matched unit and other questions! Thanks in advance!

by dan sw fl
Replies
20
Views
472

### > MERV 6 is one of the success paths to KILLING A...

> MERV 6 is one of the success paths to KILLING A SYSTEM
10. ## Thread: 1.5 Ton Goodman Heat Pump- R22 Split system matched

by dan sw fl
Replies
51
Views
807

### Check superheat & subcooling, refrigerant level

The unit is running at about 6% capacity. Q sensible / Q total Nominal capacity

Q sensible = 1.08 * CFM* dT

500 CFM (5 * ~100 CFM per vent / could be lower ?!)
1.08 Constant
73'F Tin (Room...
11. ## Thread: Help with sizing, evaluating proposals

by dan sw fl
Replies
8
Views
329

### "Typical" annual electric usage would be < 15,000...

"Typical" annual electric usage would be < 15,000 kw-hr.
Your 42,000 kw-hr is obviously quite extreme.

I do not understand how anyone performing an energy audit has not provided
more guidance...
12. ## Thread: 1.5 Ton Goodman Heat Pump- R22 Split system matched

by dan sw fl
Replies
51
Views
807

### MILLINGTON MUNI ARP 35.35 NORTH 89.87 WEST /...

MILLINGTON MUNI ARP
35.35 NORTH 89.87 WEST / 322 Elevation

ASHRAE
99.6% 99.0%
14.0'F 19.6'F

0.4%
DRY BULB
........... WET BULB
13. ## Thread: 1.5 Ton Goodman Heat Pump- R22 Split system matched

by dan sw fl
Replies
51
Views
807

### What is the Supply Air temperature of the 1.5...

What is the Supply Air temperature of the 1.5 Ton?

Is the Bonus Room Relative Humidity greater than 53%?
[ must be measured with an appropriate, accurate hygrometer ]

If there is a...
14. ## Thread: Information needed on outside space needed for 2 new Trane Heat Pumps

by dan sw fl
Replies
13
Views
396

### Post # 8 with photos look like a Prescription...

Post # 8 with photos look like a

Prescription for Disaster

given the Confined Space with HIGH WALL

+ being in Phoenix.
15. ## Thread: Building new home in MN.

by dan sw fl
Replies
8
Views
377

### I would presume that the Heat Loss at 0'F would...

I would presume that the Heat Loss at 0'F would be < 40,000 BTU/HR
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,....... so at 35'F would be < 20,000 BTU/HR -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, more...
16. ## Thread: Electric furnace recommendation

by dan sw fl
Replies
8
Views
305

### Heat Pump will SIGNIFICANTLY reduce Operating Cost\$

ELECTRIC STRIPS

Heat Loss = ~ 40,000 BTU/HR at 0'F
given my assumptions for 1985 construction

As you supporting the local electric utility to the tune of > \$3,400 / year
17. ## Thread: 26 year old Trane needs to be replace...Help!!

by dan sw fl
Replies
3
Views
288

### VAULTED Ceilings are Always an issue with...

VAULTED Ceilings are Always an issue with increased heat gains.

You may wish to select 16 SEER equipment.
for example, multi-stage
Probably a 3-ton system, given Columbia SC has many days near...
18. ## Thread: Help With Heat Pump

by dan sw fl
Replies
3
Views
226

### GENERAL OBJECTIVES: ACCA Standard 5...

GENERAL OBJECTIVES: ACCA Standard 5
http://www.energystar.gov/ia/home_improvement/home_contractors/qispec.pdf

http://www.heatpumpguide.com/ratings-reviews/bryant-heat-pump-reviews-and-ratings/
19. ## Thread: Electric furnace recommendation

by dan sw fl
Replies
8
Views
305

### 50,000 BTU/Hr is way TOO Much for MANY...

50,000 BTU/Hr is way TOO Much for MANY residences.

LOCALE?

SIZE & AGE of Home?

# of windows __
20. ## Thread: Seeking advice on repair cost and if I should just replace system

by dan sw fl
Replies
5
Views
223

### One should INVESTigate variable and multi-speed...

One should INVESTigate variable and multi-speed equipment OPTIONS in the 18 SEER Range given the electric rates in California.
21. ## Thread: Seeking advice on repair cost and if I should just replace system

by dan sw fl
Replies
5
Views
223

### How old is the current 5-Ton per the technician?...

How old is the current 5-Ton per the technician?
" __ " _ " _ " __ "__ OVERSIZED Furnace?

More than likely older than desired
and perhaps
_ way beyond it's useful life _

A fix of a leak...
22. ## Thread: Heat pump in western NC

by dan sw fl
Replies
14
Views
383

### Manual J type calc and Annual Electrical Costs for Heating & Cooling

4-ton is required based on My assumptions of insulation values and window properties.
18 SEER 10 HSPF

See my attached calc for a 1,850 square foot, single story, 1970-built residence.
20'F =...
23. ## Thread: Heat pump in western NC

by dan sw fl
Replies
14
Views
383

### ... floor to ceiling by 120" wide window" for...

... floor to ceiling by 120" wide window" for EACH bedroom certainly seems to be a typo on 120"
( 10 feet by 8 feet - is simply Not Reasonable).

... 4 , 5, 6 OR x Bedrooms ?

What city? ...
24. ## Thread: Is my new ac undersized ?

by dan sw fl
Replies
11
Views
451

### 1) A/C should run CONSTANT from about noon to at...

1) A/C should run CONSTANT from about noon to at least 7 PM
.............................._ :eek2: _................------- _ ---------
________ when it's More Than 90'F outside.

It appears...
25. ## Thread: Replacing old Unit with 2 or 5 Stage Unit

by dan sw fl
Replies
3
Views
241

### -- Sounds like you may live in a rather moderate...

--
Sounds like you may live in a rather moderate climate for both heating and cooling.
Why are you entertaining use of geothermal?
Is your HVAC replacement budget more than \$30,000?

Is that...

by dan sw fl
Replies
7
Views
322

### During maximum heat gain periods, a 5-ton air...

During maximum heat gain periods, a 5-ton air handler should be providing about 1,800 CFM.
[ assuming the residence actually needs a 5 ton unit ...i.e. Perhaps > 3,000 square foot home ]
27. ## Thread: Mickey Mouse Rip Off or Legit Job?

by dan sw fl
Replies
5
Views
539

### I could not tell what the Actual outcome would be...

I could not tell what the Actual outcome would be
for certain
without the BIG PICTURE provided by performing
ACCA Manual J and D calculations.

IF anyone tells you otherwise, they had better...

by dan sw fl
Replies
4
Views
238

### Start a cat shelter

Start a cat shelter
29. ## Thread: MY HOME AIR CONDITIONER IS NOT COOLING LOWER THAN 29 DEGREE

by dan sw fl
Replies
11
Views
308

### So, it's 105'F outside and you can ONLY cool to...

So, it's 105'F outside and you can ONLY cool to 76'F.
_ _ Sounds like __ THAT'S PERFECT __ .!..!

And at night, when it's 89'F Out, you are able achieve 60'F.
_______________ {stuck on...
30. ## Thread: Your opinion on AC units for a new home

by dan sw fl
Replies
10
Views
439

### http://www.lennox.com/products/air-conditioners/XC...

http://www.lennox.com/products/air-conditioners/XC16/

- - 2 TON - -
31. ## Thread: Carrier Performance Series A/C

by dan sw fl
Replies
6
Views
1,450

### What are the EXACT Run Times (On AND OFF...

What are the EXACT Run Times (On AND OFF durations) versus outside conditions?

Locale?

Condenser Unit and air handler sizes?

House size and age?
32. ## Thread: Is a/c going of every ten mins short cycling

by dan sw fl
Replies
23
Views
796

### So it.s ON for 11 minutes and OFF for 3 minutes...

So it.s ON for 11 minutes and OFF for 3 minutes even in Mid- to Late Afternoon when it's 92'F outside?
33. ## Thread: What went wrong and where should I go from here?

by dan sw fl
Replies
8
Views
331

### Sounds fairly normal for an "mid-life or older"...

Sounds fairly normal for an "mid-life or older" system.

It does Not sound like you have taken advantage of an ANNUAL MAINTENANCE CONTRACT.

We don't know if the system or components in general...
34. ## Thread: Where can I get an unbiased estimate?

by dan sw fl
Replies
11
Views
466

### GOOD SELECTION.

GOOD SELECTION.
35. ## Thread: Where do you see SEER ratings going, and where is the sweet spot in SEER vs price?

by dan sw fl
Replies
8
Views
458

### Determine Life Cycle Cost

" Sweet spot " = What?

Depends on:
... equipment life,
... operating cost (thermal building envelope & electricity \$ rate),
... installed cost
... & maintenance costs.

OPERATING CO\$T =...
36. ## Thread: Effect of over-sized furnace (2 stage unit)

by dan sw fl
Replies
8
Views
362

### http://www.allseasonsheatingsd.com/wp-content/uplo...

DEPENDS ON
AIR FLOW REQUIREMENTS

3 TONS = ~1,100 CFM
Maximum cooling is probably only necessary < 4 hours / day...
37. ## Thread: Manual J Calculations

by dan sw fl
Replies
12
Views
592

### Calc can NOT be accurate for a 1914 Residence...

Calc can NOT be accurate for a 1914 Residence without a specific, applicable Infiltration rate.
Infiltration rate could be in the 0.6 to 1.6 Air Change per Hour (A.C.H.) range.

I would not wish...
38. ## Thread: New HVAC help

by dan sw fl
Replies
10
Views
507

### 4-ton 2 STAGE seems most appropriate. ...

4-ton 2 STAGE seems most appropriate.

However,
... 94,389 BTU/HR Heat Loss would probably only apply to a > 80 year old,...
39. ## Thread: COP and operating time of day (running costs)

by dan sw fl
Replies
5
Views
398

### A/C efficiency decrease would be in the ball park...

A/C efficiency decrease would be in the ball park of 15% in comparing performance at 95'F versus 75'F
40. ## Thread: Thrifty professionals shoot small on heat pump?

by dan sw fl
Replies
8
Views
464

### NOT IF the residence is >> 70 years old.

NOT IF the residence is >> 70 years old.
41. ## Thread: Ameristar v. Trane at the Beach

by dan sw fl
Replies
6
Views
420

### The TRANE unit ought to last ~ 9 years in this...

The TRANE unit ought to last ~ 9 years in this absurdly corrosive environment,
whereas, the Ameristar may only last ~ 6 years.

Therefore, the TRANE unit may be about 30% less costly over the...
42. ## Thread: replacing 1.5ton heatpump system, different SEER levels

by dan sw fl
Replies
5
Views
343

### One might expect to save in the range of \$ 30 per...

One might expect to save in the range of \$ 30 per year
based on \$0.13/ kw-hr for a 1.5 ton A/C
and ….. ……. ….. .. 1,000 Full Operating Hours
SEER _ _ _ KW/TON _ _ _ \$\$\$/ YEAR
10 _ _...
43. ## Thread: Thrifty professionals shoot small on heat pump?

by dan sw fl
Replies
8
Views
464

### 1,150 Sq foot, single floor Age of condo < 35...

1,150 Sq foot, single floor
Age of condo < 35 years old

A 2-ton unit should be
_MORE THAN ADEQUATE_ for 90'F design temperature
and less than 900 Cooling Degree Days (CDD).
44. ## Thread: Leaving for Vacation

by dan sw fl
Replies
5
Views
329

### With a programmable thermo-stat, I would set to...

With a programmable thermo-stat,
I would set to 82'F for 8 am to 5 am with
... .. it set to 78'F from 5 am to 8 am.
Operating cost would generally be ~ \$1 /day for a 3-ton unit.

I believe...
45. ## Thread: Cooling Equipment/Heat Pump Sizing

by dan sw fl
Replies
3
Views
217

### http://www.acca.org/standards/acca-speed-sheets/

http://www.acca.org/standards/acca-speed-sheets/
46. ## Thread: Does 2.5 + 3.0 = 2.9?

by dan sw fl
Replies
33
Views
1,270

### http://www.icpeqp.com/AHRIratings/ratings.aspx?Bra...

http://www.icpeqp.com/AHRIratings/ratings.aspx?Brand=Keeprite

2.5 Ton ................. 3-ton
I'd say based...

by dan sw fl
Replies
5
Views
576

### 18 SEER 3-ton unit would save \$200 over a 14 SEER...

18 SEER 3-ton unit would save \$200 over a 14 SEER

Used \$0.12/ kw-hr

Heating is ~ \$300 per year at \$1.00 /therm
R -5.0 for walls

Q heating is 24,060 BTU/HR at 35'F dT

Q cooling sensible...
48. ## Thread: New Construction Heat Pump Size

by dan sw fl
Replies
7
Views
397

### 1 Yes 4,800 Sq. Feet - One Story Window...

1 Yes

4,800 Sq. Feet - One Story

Window U-value 0.28 _ 620 Sq Feet
Ceiling R-45
Wall ...R-18

51,000 BTU/HR at 10'F

by dan sw fl
Replies
27
Views
1,207

### 1 There is ALWAYS A WAY.! It just the effort...

1 There is ALWAYS A WAY.!
It just the effort ( & \$\$\$ ) that is needed that makes it difficult to install & control

SunRoom with 200 square feet of glass could require nearly 1.5 tons in the...

by dan sw fl
Replies
27
Views
1,207

### With such a complex duct system, it would have to...

With such a complex duct system, it would have to be METAL DUCT to
provide anywhere close to the design flow rate.

If the filter size is less than 600 square inches,
it should be changed to...
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