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Old 07-20-2018, 12:24 PM
 
Location: Manhattan
20,341 posts, read 26,889,601 times
Reputation: 9156

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I had an elaborate "heat pump" system in my last apartment, Jersey City Waterfront. It was heat pump in name only because it switched off heat pump mode and into $$$$resistance mode $$$$ the instant the outside temperature went below 40 degrees and didn't switch back to heat pump mode until the temperature went above 55.


This is to prevent icing.


You can IMAGINE how well this worked in our local Winters.<sarcasm>


I removed the outside thermostat and drew up a graph of the icing point dependence on temperature and humidity (dew point) and operated the unit manually. I found that on the driest days I could get good heat even with an outside temperature of 20F but if it was raining or snowing about 35 F would freeze up the unit and I used space heaters instead. I needed something like a minimum 15 degrees difference between temperature and dew point to run dependably without icing...not exactly sure. I cannot remember if I ever reconnected the outside thermostat. If I didn't somebody had a lot of fun after I left.




Heat pumps suck in our environment: that's why we see so few of them. THey are for the dry Southwest...or Saudi Arabia.

Last edited by Kefir King; 07-20-2018 at 12:36 PM..
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Old 07-22-2018, 08:21 AM
 
Location: In the heights
20,646 posts, read 22,192,066 times
Reputation: 10628
Quote:
Originally Posted by Kefir King View Post
I had an elaborate "heat pump" system in my last apartment, Jersey City Waterfront. It was heat pump in name only because it switched off heat pump mode and into $$$$resistance mode $$$$ the instant the outside temperature went below 40 degrees and didn't switch back to heat pump mode until the temperature went above 55.


This is to prevent icing.


You can IMAGINE how well this worked in our local Winters.<sarcasm>


I removed the outside thermostat and drew up a graph of the icing point dependence on temperature and humidity (dew point) and operated the unit manually. I found that on the driest days I could get good heat even with an outside temperature of 20F but if it was raining or snowing about 35 F would freeze up the unit and I used space heaters instead. I needed something like a minimum 15 degrees difference between temperature and dew point to run dependably without icing...not exactly sure. I cannot remember if I ever reconnected the outside thermostat. If I didn't somebody had a lot of fun after I left.




Heat pumps suck in our environment: that's why we see so few of them. THey are for the dry Southwest...or Saudi Arabia.
That partially sounds like a badly designed heat pump--when was this? I've heard that they've gotten quite a bit better.
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Old 07-22-2018, 05:16 PM
 
18,677 posts, read 12,117,012 times
Reputation: 12274
Today and likely for rest of week will be weather where a dehumidifier will be of more use than an AC.


Wet, cool and damp weather with temps too low for AC (would have to crank mine down to <70F for it to even come on), but not entirely comfortable without.
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Old 07-22-2018, 06:59 PM
Status: "It's cold outside." (set 22 days ago)
 
Location: Manhattan
1,865 posts, read 811,391 times
Reputation: 872
Quote:
Originally Posted by BugsyPal View Post
Today and likely for rest of week will be weather where a dehumidifier will be of more use than an AC.


Wet, cool and damp weather with temps too low for AC (would have to crank mine down to <70F for it to even come on), but not entirely comfortable without.
You said it. The worst kind of weather for indoors.
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Old 07-23-2018, 09:21 AM
 
3,356 posts, read 3,185,172 times
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SHVT UP and stop complaining about nothing, y'all....


If anyone complains about the heat in NYC again, s/he will be deported to the burning Tokyo...honestly, you are spoiled by mother nature who has a special love for NYC.


Japan: Deadly heat wave continues as temp hits record 41.4C near Tokyo
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Old 07-23-2018, 09:26 AM
 
1,860 posts, read 534,747 times
Reputation: 1308
Quote:
Originally Posted by leoliu View Post
SHVT UP and stop complaining about nothing, y'all....


If anyone complains about the heat in NYC again, s/he will be deported to the burning Tokyo...honestly, you are spoiled by mother nature who has a special love for NYC.


Japan: Deadly heat wave continues as temp hits record 41.4C near Tokyo
We don't live in Tokyo. We can complain as much as we want.
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Old 07-23-2018, 10:28 AM
 
10,760 posts, read 20,993,828 times
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Agree with Hannah!
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Old 07-23-2018, 11:00 AM
 
1,860 posts, read 534,747 times
Reputation: 1308
Quote:
Originally Posted by henna View Post
agree with hannah!
(big grin-it wonít show up as a smilie unless I type something else. HTML bug I guess)

Anyone have any experience with portable air conditioners?
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Old 07-23-2018, 11:34 AM
 
Location: Manhattan
20,341 posts, read 26,889,601 times
Reputation: 9156
Quote:
Originally Posted by OyCrumbler View Post
That partially sounds like a badly designed heat pump--when was this? I've heard that they've gotten quite a bit better.

They were Zone Aire units installed with the new construction in 1987. Rumor had it tha the developer (Lefrak) OWNED Zone Aire.


As they quickly fell apart they were replaced by another brand (forgot name) that were quierter but still the same awful heat pump thermostatic shut-off.


I stopped using them after my first $200 electric bill. (People complained of $400 bills for 1 bedroom...I was more frugal.)


AC was another nightmare: 30 amp/220Volt soclket meant I needed two 15,000 BTU units. Try sleepin in humid Jersey City with an AC that goes on for 5 minutes every half hour, then shuts off and blows wet air back out.
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Old 07-23-2018, 11:50 AM
 
1,860 posts, read 534,747 times
Reputation: 1308
Quote:
Originally Posted by Kefir King View Post
They were Zone Aire units installed with the new construction in 1987. Rumor had it tha the developer (Lefrak) OWNED Zone Aire.


As they quickly fell apart they were replaced by another brand (forgot name) that were quierter but still the same awful heat pump thermostatic shut-off.


I stopped using them after my first $200 electric bill. (People complained of $400 bills for 1 bedroom...I was more frugal.)


AC was another nightmare: 30 amp/220Volt soclket meant I needed two 15,000 BTU units. Try sleepin in humid Jersey City with an AC that goes on for 5 minutes every half hour, then shuts off and blows wet air back out.
Thatís pretty sad.
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