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re: Brand of AC/Heat Pump
Posted on 2/14/24 at 7:42 pm to tadman
Posted on 2/14/24 at 7:42 pm to tadman
I’ve had a rheem for 6 years. It has one of the larger filters in the system itself. Other than changing the filter, I’ve done absolutely nothing to it.
When the outside temp stays at 96-100°, the inside of my house stays at 68.
I’ve been very pleased.
When the outside temp stays at 96-100°, the inside of my house stays at 68.
I’ve been very pleased.
0
Posted on 2/15/24 at 8:14 am to notsince98
Heating efficiency just isn't something we really need to worry about down here. My heater probably runs 50 days a year at the absolute most. It is a major concern for a lot of the country though.
I can't wait to see what I gain going from a 30 year old system to a new one. It's got to be drastically better. I was tapping on $600 a month light bill last summer.
It sucks that the 30% tax credit only applies if you buy a heat pump. Ditching this old arse unit for anything new oughta be 100% subsidized by that logic
I can't wait to see what I gain going from a 30 year old system to a new one. It's got to be drastically better. I was tapping on $600 a month light bill last summer.
It sucks that the 30% tax credit only applies if you buy a heat pump. Ditching this old arse unit for anything new oughta be 100% subsidized by that logic
This post was edited on 2/15/24 at 8:15 am
Posted on 2/15/24 at 9:07 am to tadman
Without reading everything. I do know, American Standard, Rheem and Rudd are good brands. Trane in the last house I built for myself. That too is a good brand.
Heating with gas is always better. Heating with electric strips, will cost way more in the long run. The tax credits saved will cost you every year.
After installing a new unit, add insulation, you can mix blown and batts. The added batts, need to be unfaced.
Heating with gas is always better. Heating with electric strips, will cost way more in the long run. The tax credits saved will cost you every year.
After installing a new unit, add insulation, you can mix blown and batts. The added batts, need to be unfaced.
This post was edited on 2/15/24 at 5:57 pm
Posted on 2/15/24 at 9:58 am to LSUDad
Had a Bosch unit put in my last house. Loved the fact that I couldnt hear it run, hated the fact that we never seemed to get the humidity levels sorted out unless I ran it down to like 68. The point of the variable speed for me was to run it longer at low speeds to stay around 71 or so but enjoy low levels of humiditiy inside.
Never really got there.
Never really got there.
Posted on 2/15/24 at 11:08 am to tigerfoot
Well that's good to know, I was planning to oversize with a variable speed air handler and compressor thinking it would just run lower speed to maintain humidity.
Posted on 2/15/24 at 12:01 pm to DownshiftAndFloorIt
I think the technology was so new that we would’ve gotten there eventually
The unit was super expensive and you had to be next to it to know it was running
The unit was super expensive and you had to be next to it to know it was running
Posted on 2/15/24 at 12:11 pm to tigerfoot
I'm torn. I dont know if I want to go with a fancy high seer multispeed big arse setup, or just the cheapest name-brand stuff I can get sized per the traditional guidance.
Odds are I end up with the latter, but it's far more fun to brain strain on the fancy stuff.
Odds are I end up with the latter, but it's far more fun to brain strain on the fancy stuff.
Posted on 2/15/24 at 12:30 pm to tigerfoot
quote:
Had a Bosch unit put in my last house. Loved the fact that I couldnt hear it run, hated the fact that we never seemed to get the humidity levels sorted out unless I ran it down to like 68. The point of the variable speed for me was to run it longer at low speeds to stay around 71 or so but enjoy low levels of humiditiy inside.
Never really got there.
It was because of how the Bosch controls are implemented. The t-stat doesn't control the capacity output like every other variable capacity system out there. They dont do variable capacity compressors the same as everyone else. There is a dipswitch on the heat pump units that allow it to reduce humidity better that many dont know about.
Posted on 2/15/24 at 12:31 pm to DownshiftAndFloorIt
quote:
Well that's good to know, I was planning to oversize with a variable speed air handler and compressor thinking it would just run lower speed to maintain humidity.
Do not oversize. You waste money on equipment. You waste money on electricity and you will get less comfort and humidity control.
Posted on 2/15/24 at 12:34 pm to DownshiftAndFloorIt
quote:
I'm torn. I dont know if I want to go with a fancy high seer multispeed big arse setup, or just the cheapest name-brand stuff I can get sized per the traditional guidance.
Odds are I end up with the latter, but it's far more fun to brain strain on the fancy stuff.
I have owned and operated both traditional setups and high end modulating setups. Maybe I can help ease the paralysis by analysis.
1) how many zones do you have?
2) Your current AC/Heat pump is 4-ton. During the worst times of summer, does it struggle to maintain your setpoint on your t-stat?
4) what will you use for heating?
Posted on 2/15/24 at 12:52 pm to notsince98
How is oversizing a variable capacity unit not a good thing? Is it not smart enough to vary compressor and blower speed to appropriately maintain temp and humidity?
What's the point of variable speed stuff if it isn't controlled smartly enough to give me a whole lot of horsepower when I need it and lower power when I don't?
What's the point of variable speed stuff if it isn't controlled smartly enough to give me a whole lot of horsepower when I need it and lower power when I don't?
This post was edited on 2/15/24 at 1:01 pm
Posted on 2/15/24 at 1:01 pm to DownshiftAndFloorIt
quote:
How is oversizing a variable capacity unit not a good thing? Is it not smart enough to vary compressor and blower speed to appropriately maintain temp and humidity?
It depends on the system. Variable capacity systems really shine in multi-zone installations where ductwork presents problems. In these situations, humidity control is very limited but performance is excellent.
In a single zone system, the modulating equipment "can" have increased humidity removal but it can be at the cost of consistent comfort throughout a house because lower outputs can reduce CFMs to the point that your longest runs just dont get enough air to cool that space properly. Ductwork is designed to provide a specific CFM level all the time. Different CFM levels create different static pressures which change the flow within the ductwork.
EDIT: Oversized is always bad. If you have an oversized modulating system that is trying to run max out and your ductwork isn't sized large enough, you will get loud blowing from the ductwork and your static pressures will be too high. In addition to increased noise, this reduces the lifespan of the ECM blower considerably. Oversizing is never a good idea.
This post was edited on 2/15/24 at 1:04 pm
Posted on 2/15/24 at 1:04 pm to notsince98
That makes sense. Yep, old school it is for me.
Posted on 2/15/24 at 1:16 pm to tigerfoot
quote:
Had a Bosch unit put in my last house. Loved the fact that I couldnt hear it run, hated the fact that we never seemed to get the humidity levels sorted out unless I ran it down to like 68. The point of the variable speed for me was to run it longer at low speeds to stay around 71 or so but enjoy low levels of humiditiy inside. Never really got there.
Known issue with the Bosch variable capacity units - humidity control - and as notsince98 stated they do operate differently other most variable capacity HVAC systems. HVAC techs that installed them in their own houses could not resolve the humidity control issue. I considered installing one in my house until learned of this issue.
This post was edited on 2/15/24 at 1:16 pm
Posted on 2/15/24 at 1:17 pm to DownshiftAndFloorIt
quote:
That makes sense. Yep, old school it is for me.
That is where I have ended up, too. If you have a single zone system, you can still get good humidity removal with a variable speed blower and a single stage AC. As long as the AC is not oversized, it will control humidity on its own when it is summer time. When you are in the shoulder months, you can use a t-stat with dehumidify control on it and reduce the variable speed blower to 70%. This will increase the humidity removal capability in those times when the system isn't running as much. It is really effective but the key is making sure the AC is not oversized.
Also, communicating controls for modulating systems are very expensive. You have no freedom to choose your controls when you go that route.
Posted on 2/15/24 at 1:20 pm to CrawDude
quote:
Known issue with the Bosch variable capacity units - humidity control - and as notsince98 stated they do operate differently other most variable capacity HVAC systems. HVAC techs that installed them in their own houses could not resolve the humidity control issue. I considered installing one in my house until learned of this issue.
Yup it is a tough situation because you would normally reduce CFMs to improve latent cooling capacity but as you reduce the CFMs, the Bosch compressor controls just reduce the compressor output to match. So you get what you get as far as humidity removal and other than the dip switch, you cant do anything else.
Posted on 2/15/24 at 1:21 pm to tadman
2 Carrier Infinity systems.
Expensive to replace any part on the systems but cools the frick out of the house in the hottest 115 degree months.
Past house had 2 Goodman, basic systems that ran like champs the 12 years we lived there.
As you've said, I'd go with best basic systems you can.
Expensive to replace any part on the systems but cools the frick out of the house in the hottest 115 degree months.
Past house had 2 Goodman, basic systems that ran like champs the 12 years we lived there.
As you've said, I'd go with best basic systems you can.
This post was edited on 2/15/24 at 1:26 pm
Posted on 2/15/24 at 1:26 pm to notsince98
quote:
You have no freedom to choose your controls when you go that route.
Yea and it annoys me because I do a lot of control system design work.
Mine won't be oversized. I'd rather an undersized one run non stop.
Posted on 2/15/24 at 1:35 pm to notsince98
quote:
how many zones do you have?
2) Your current AC/Heat pump is 4-ton. During the worst times of summer, does it struggle to maintain your setpoint on your t-stat?
4) what will you use for heating?
1- 1
2- 3 ton central unit and a 1 ton wall banger. Struggles biggly. My central unit and air handler are 30 years old and I seriously doubt they actually do 3 tons worth of cooling.
4?- gas
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