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PTAC air conditioner/heater #4570318
11/10/17 09:55 PM
11/10/17 09:55 PM
Joined: Mar 2003
Posts: 582
USA
Joe1 Offline OP
Joe1  Offline OP
Joined: Mar 2003
Posts: 582
USA
I live in a condo that has Hotel type heater/AC units. My 3 GE units are 30+ years old and one is shot, one works iffy and one is serviceable.

I'm thinking about replacing them before the colder weather arrives in NJ this winter. My research indicates that for heating, some use a heat pump while others use electric heat. The heat pump models are a bit more expensive and more energy efficient, but the electric heat models heat better and are quiter.

Can l expect gains in efficiency compared to my ancient GE models? Are heat pump models more or less reliable than electric heater models?

The major brands seem to be Amana, Friedrich,GE, Frigidaire, and LG. Should any be avoided?

I'm interested in hearing feedback from those that have some knowledge about these things.

Re: PTAC air conditioner/heater [Re: Joe1] #4570361
11/10/17 11:00 PM
11/10/17 11:00 PM
Joined: Feb 2013
Posts: 10,684
Phoenix, AZ
Nick1994 Online content
Nick1994  Online Content
Joined: Feb 2013
Posts: 10,684
Phoenix, AZ
From what I've read on hvac-talk.com, brand of equipment doesn't matter that much, the installation is the most important role. That includes correct sizing.


2015 Hyundai Sonata 2.4L 84k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 230k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: PTAC air conditioner/heater [Re: Joe1] #4570403
11/10/17 11:53 PM
11/10/17 11:53 PM
Joined: Sep 2015
Posts: 1,523
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,523
USA
You can compute the efficiency of the old units from the nameplate cooling BTU divided by cooling watts. It's going to be remarkably low.

Since a heat pump runs the compressor to heat, it will be about as loud in the winter as it is in the summer. Heat pump will fall back to electric heat when outdoor temperature is too low for the heat pumping to keep up.

Converting to mini-splits is the way to go, if the building allows them.

Last edited by mk378; 11/10/17 11:59 PM.
Re: PTAC air conditioner/heater [Re: Joe1] #4570425
11/11/17 12:56 AM
11/11/17 12:56 AM
Joined: Aug 2008
Posts: 3,155
USA
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,155
USA
Electric heat (like with strips) is 100% efficient.. all of the energy consumed turns into heat. However, the amount of electricity consumed to create enough BTUs to heat a home is often quite large.

Using 120V for an example, a 1500W portable electric heater creates around 5100 BTUs of heat.


However, a 120V heat pump that consumes 1500W can create 11,000 BTUs of heat (under ideal conditions) because it extracts any heat in the air outside via the refrigeration cycle and dumps it into the living space. The drawback with a heat pump, though, is that there is an ideal temperature point for it to run.. and if the outside air is any colder then you may not be able to extract enough heat to make the operation worthwhile.

If you replace your 30 year old units, yes there is very likely to be a gain in efficiency, largely because the government has mandated minimum efficiency standards for new systems.

Re: PTAC air conditioner/heater [Re: Joe1] #4570462
11/11/17 05:09 AM
11/11/17 05:09 AM
Joined: Jan 2013
Posts: 1,842
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 1,842
Texas
If it were me , I would replace the worst of the units with a heat pump & see how you like it . Then go from there .

If your existing equipment is that old , I would expect to see some reduction in electric cost .


Wyr
God bless
Re: PTAC air conditioner/heater [Re: Joe1] #4574257
11/14/17 09:32 PM
11/14/17 09:32 PM
Joined: Mar 2003
Posts: 582
USA
Joe1 Offline OP
Joe1  Offline OP
Joined: Mar 2003
Posts: 582
USA
My old models have an EER rating of about 8. Newer models go up to 13+ EER. If my electric bill is 100 a month with old units, what would cost be with new units with a 13 EER?

Thanks for the info.

Re: PTAC air conditioner/heater [Re: Joe1] #4574363
11/14/17 11:28 PM
11/14/17 11:28 PM
Joined: Jan 2013
Posts: 1,842
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 1,842
Texas
I am accustomed to seeing efficiency ratings in SEER numbers .

Check out
http://ingramswaterandair.com/eertoseerconversion.php

But a wild guess would be something like $ 100 x 8 / 13 = $ 61.54 . That may not be very accurate . Hopefully some one more knowledgeable than I can answer .

However , it the old equipment is not operating well / correctly ( low on refrigerant , for instance ) , it will be running longer than necessary & using more energy than necessary .

So , I would think , in that case , the numbers could be better than that ?

Best of luck , :-)


Wyr
God bless

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