Mini split ac

[Badmofo529]

Yes i am sure it is over-sized for the area. I did not know that could be a issue and would make some sense if that is what is going on. Everything seems to function fine other than the humidity issue.

Yup that's probably it. Only reason I know that is This Old House lol, saw an episode where someone had humidity issues in there house, and I turned out to be an oversized system.

Normally bigger is better, but with HVAC it's gotta be balanced properly.

 

[Dbear]

Yup that's probably it. Only reason I know that is This Old House lol, saw an episode where someone had humidity issues in there house, and I turned out to be an oversized system.

Normally bigger is better, but with HVAC it's gotta be balanced properly.

Took the words out of my mouth lol.

Oversize system doesnt get to run long enough to remove the extra humidity before it reaches the temp setpoint & shuts down. Undersize system runs all the time causing premature failure & a higher bill.

My rule of thumb in socal desert is 5-6k btu cooling power per 1k of open hood lights. Cooler areas can get away with more watts/btu. Some days in summer I'm fighting 110+ heat outside so my system needs to be able to compensate for that. Insulation is a super big deal too, can make a world of difference.

 

[Capt. C]

Yup that's probably it. Only reason I know that is This Old House lol, saw an episode where someone had humidity issues in there house, and I turned out to be an oversized system.

Normally bigger is better, but with HVAC it's gotta be balanced properly.

Took the words out of my mouth lol.

Oversize system doesnt get to run long enough to remove the extra humidity before it reaches the temp setpoint & shuts down. Undersize system runs all the time causing premature failure & a higher bill.

My rule of thumb in socal desert is 5-6k btu cooling power per 1k of open hood lights. Cooler areas can get away with more watts/btu. Some days in summer I'm fighting 110+ heat outside so my system needs to be able to compensate for that. Insulation is a super big deal too, can make a world of difference.

I guess that is whats going on. It is installed in a bedroom that is approximately 120 sq feet less than 1000 cubic feet. I don't even know if they make one that small..

 

[Dbear]

I guess that is whats going on. It is installed in a bedroom that is approximately 120 sq feet less than 1000 cubic feet. I don't even know if they make one that small..

How many watts of lighting are you using? Hid or led? I'm sure I've seen your set up but I might be confusing it with another & it's easier just to ask here lol.

 

[Baja.Beaches]

I don’t want to spread misinformation but after I looked closer at the unit I have the 18k not the 12k. Dang, memory grows dim sometimes.

I think it was a little cheaper last year but still a great deal. Not a lot of choices in ductless systems.

https://www.costco.com/mrcool-diy-18k-btu-mini-split-air-conditioner-and-heat-pump-with-wi-fi-smart-controller.product.100573104.html

 

[Dbear]

I don’t want to spread misinformation but after I looked closer at the unit I have the 18k not the 12k. Dang, memory grows dim sometimes.

I think it was a little cheaper last year but still a great deal. Not a lot of choices in ductless systems.

https://www.costco.com/mrcool-diy-18k-btu-mini-split-air-conditioner-and-heat-pump-with-wi-fi-smart-controller.product.100573104.html

Damn that's a pretty good deal for a 1.5 ton.

 

[Baja.Beaches]

It really is a killer deal.

It’s coming back to me, the 12k unit was what I was looking at for our bedroom since it is 115v, the 18k is 220. I had to run new electric either way for the man cave so I went bigger.

Besides being ductless, another big selling point is the DC inverter and variable speed compressor, a very efficient set up as far as power needs. Should last a lot longer too. inverter models are the latest technology.

No regrets here.

 

[Dbear]

It really is a killer deal.

It’s coming back to me, the 12k unit was what I was looking at for our bedroom since it is 115v, the 18k is 220. I had to run new electric either way for the man cave so I went bigger.

Besides being ductless, another big selling point is the DC inverter and variable speed compressor, a very efficient set up as far as power needs. Should last a lot longer too. inverter models are the latest technology.

No regrets here.

Nice. Yeah I mean my window banger is badass & gets the job done no problem but it just sucks soooooooo much juice. Inverter tech with the minis is where it's at ?

 

[Capt. C]

How many watts of lighting are you using? Hid or led? I'm sure I've seen your set up but I might be confusing it with another & it's easier just to ask here lol.

Running a mixed bag of lights. Current flower room is a 16 sq ft closet in the bedroom. Also have a 2x4 cabinet and a 4x4 tent in the same room. I somehow get everything to work off the main lung room (bedroom). Would not be able to do it without the mini split. I suspect you will be able to have that mini split pay for itself ( electric bill savings)in not to long of a period.

 

[Caddis]

My situation is a bit different, I have a little guest cottage, like 400 sq ft total, old & not insulated. The tent is in the bathroom there but seriously overheated the whole studio which is my man cave refuge as well. I spend a lot of time in it, I am sitting in it right now. I am cooling the entire cottage, not jsut the tent area with a 1200 BTU, once it is cooled off it is just loafing along, not using all that much electricity.

A game changer for me, I have been shutting down the tent during summer, the previous wall unit was super loud & could not cool it. I hated that thing.

Installation was not that complicated either just me & a buddy although we did need to run an electic sub panel, the electrical was ancient & no 220.

I am not needing a dehumidifier generally, the AC usually dries it out enough for my modest needs but I do run a small dehumidifier sometimes.

That was another question, would a 1200 BTU be large enough?
Real world reviews sure are nice!
Thanks!

@Capt. C is the unit oversized for the space by chance? If the AC is only running for short bursts it doesn't have enough time to pull any humidity out. Although if it's pretty humid out, and the plants are transpiring hard the AC just might not be enough to pull rh down on its own.

Thats one reason bigger may not necessarily better? Need to be careful not to oversized.
Short cycling will put a lot of wear on the unit, I would think?

Dang y’all type fast, your past this?

 

[Dbear]

That was another question, would a 1200 BTU be large enough?
Real world reviews sure are nice!
Thanks!


Thats one reason bigger may not necessarily better? Need to be careful not to oversized.
Short cycling will put a lot of wear on the unit, I would think?

Dang y’all type fast, your past this?

In my area (not quite the desert but damn close) a 12000 btu unit could handle about 2000 watts of open hood hid lighting. 5-6k btus per 1k watts. Cooler climates get away with something more like 3-4k btus per 1k watts.

 

[Baja.Beaches]

That was another question, would a 1200 BTU be large enough?
Real world reviews sure are nice!
Thanks!


Thats one reason bigger may not necessarily better? Need to be careful not to oversized.
Short cycling will put a lot of wear on the unit, I would think?

Dang y’all type fast, your past this?

Not that big of a difference in price between the 12k & the 18k, do you have 220 available in your space?

These are variable speed motors, I don’t know how much cycling they would do as opposed to just running at lower RPM

 

[Caddis]

I have space in the service panel for another double pole breaker.
I’d want 220 for sure!

 

[Dbear]

I have space in the service panel for another double pole breaker.
I’d want 220 for sure!

220 is convenient af to have when you start pushing your amps limit on 110 too ?

 

[Baja.Beaches]

I have space in the service panel for another double pole breaker.
I’d want 220 for sure!

That would be be my choice for sure. The inverter models are different,

We are in the middle of a major heat spell. AC ran all day yesterday, I monitored it a little. That motor is barely working most of the time. I guess it might depend on the settings used but while running on the Cool settings it seems to run more or less continuous low RPM. Set on auto it may have stopped sometimes. Hard to tell.

@Capt. C Is your unit an inverter model? Is it ducted?

 

[Capt. C]

That would be be my choice for sure. The inverter models are different,

We are in the middle of a major heat spell. AC ran all day yesterday, I monitored it a little. That motor is barely working most of the time. I guess it might depend on the settings used but while running on the Cool settings it seems to run more or less continuous low RPM. Set on auto it may have stopped sometimes. Hard to tell.

@Capt. C Is your unit an inverter model? Is it ducted?

Ductless. Funny now that we are talking about it i have noticed that if i leave the door to the main lung room (bedroom) partially open it draws a lot more moisture out. I also checked mine is a 9000 btu. I think they might make a couple smaller than that but not that many. 120 sq ft may just be to small a room for the mini split.