4-5 Ton AC recommendation

A

Apalchen

Well-Known Member
So I have 2 rooms that are 11.5x23.5 and as of now I only have 6 lights for each room. I want to run 8 lights or more per room. Lights are gavita de 1000 hps. I've called around for estimates but so far no one has gotten back but I'm sure it's going to be high as hell. I pretty comfortable with Installing units until it comes to the line sets so I'll most likely need an AC guy for that part.

Also the units need to be able to run in extreme cold since I'm pretty far north.

So I'm looking for advice from guys who have run 4 or 5 ton units or rooms that big and what worked well and what didn't.

If I can't figure it out for some what decent price I'm just gonna order a 36k btu Mr cool diy for now and if that works out well I'll do another for the other room. All the reviews of them I have seen look great.

For now I've been able to get away with air cooling but warm weather will be here soon.

I came back to add a picture for attention since I know that it helps to get replies. Plants look a lil rough as they were crowded into veg room and aren't happy yet under the new lights. This is a seed run which I'm not happy about but I took in a clone I shouldn't have and my mothers were in quarintine until recently.

IMG_20200427_223851890_HDR.jpg
 
If you are going to pay an installer you may want them to supply the unit you choose provided they can get you a price thats fair. Let them make the retail markup instead of some online supplier. Otherwise they tend to get greedy with the install fee unless they are your friend.
 
Also, if you buy a unit online and install it yourself the warranty is voided (unless your licensed). To get the warranty you have to have the licensed installer call in and using their license number verify the unit was installed by a licensed pro.
 
Renfro said:
Mitsubishi makes the best.
Click to expand...
Yeah my only issue with that( the Mitsubishi) is I'm not sure I have the money, I'd need an AC tech for sure and they usually want double the price of the unit so say I needed 2 2 ton units per room that would be 4 units altogether and units are roughly 2 k a piece. If they did the standard HVAC pricing of doubling the equipment cost that would put me at 16k. I did call a guy who deals in them today and sent him all my specs and explained what I needed. He was going to do some figuring and get back to me.

I wish I had the money but this build out was a bit more than I expected not to mention buying the house and moving to a place with no job, then this damn stay at home order makes it so I can't go find one. Lol.

Still not sure that the more expensive units are better either, I spent good money in last spot on a Daikin that never did work right and pretty sure it was the inside coil not the lineset.
 
Why get two 2 ton units for a room? If you want more than one head get a multiple zone unit. Actually I think for 8 lights 3 tons is good.

I have had a lot of minis in my time, Mitsubishi is truly the best. Everything about them. But you can make do with a cheaper unit just have a tech thats handy when you need them. They always quit at the worst time.
 
Renfro said:
Why get two 2 ton units for a room? If you want more than one head get a multiple zone unit. Actually I think for 8 lights 3 tons is good.

I have had a lot of minis in my time, Mitsubishi is truly the best. Everything about them. But you can make do with a cheaper unit just have a tech thats handy when you need them. They always quit at the worst time.
Click to expand...
Well I thought I'd need 4 tons for 8 lights with the formula of 6000 btu per de and as far as I know mitsu doesn't make 48k mini splits. But if you think I can do 8 off a 36k including dehuey and all I will try it as you always give good advice and that would save me a ton of money.
 
Apalchen said:
Well I thought I'd need 4 tons for 8 lights with the formula of 6000 btu per de and as far as I know mitsu doesn't make 48k mini splits. But if you think I can do 8 off a 36k including dehuey and all I will try it as you always give good advice and that would save me a ton of money.
Click to expand...
It would be right at the limits if you have the DE's at 1200 watts.

I ran a 9 light room with a 3 ton but they were SE's on overdrive setting. I didn't really have to run a dehu when the lights were on due to low ambient. Really the best way to go is a larger unit since they run really efficient when they don't have to go full bore. Plus you have room for other heat loads in the future like side lighting or CO2 generator.
 
You said you have two rooms. What I did when I was on a budget is I had one room running at night using fresh air intakes to cool it and I ran the other during the day with the AC and CO2. Then when I had the money to put the other AC in with CO2 I did it. The cooling system is handy because I have backup cooling in that room for emergency, I run it at night because of that. If the AC shits I can save the room easily as the backup cooling kicks in if the temp hits a couple degrees above normal and that controller also does the CO2 so it cuts off that when it's running my intake blowers.
 
I also have all my side lights on a high temp shutoff, so if the blowers are kicking in then those are also getting out of the way.
 
That sounds like a great set up. I already have the exhaust set up for air cooling in that one room as that's what I've been doing so far it's worked great, but lights off temps always gonna be an issue in winter they too cold and summer they too hot. If you think I can cool it with 36k btu mini that's what I'm gonna do, id say if anything I would only have issues on really hot days and we don't have many of those. I'll go ahead and run exhaust for the other room as well so I can dump heat if need to. My lights will automatically dim and then shut off if temps climb too high so if it's only a few days a year il be good.

Have you ever run an AC with no c02 added. I'd like to wait til after another harvest to invest in c02 and controller. Could I just set my exhaust on a timer to kick on occasionally?
 
Apalchen said:
If you think I can cool it with 36k btu mini that's what I'm gonna do, id say if anything I would only have issues on really hot days and we don't have many of those
Click to expand...

How much power does your dehu pull? you will be right on the edge so I wouldn't wanna guarantee it with heat loads beyond the lights. For sure wouldn't if you get a non mitsubishi unit lol.

It gets super hot in the days here but my outside RH% is super low and our nights are cool (high desert climate) so thats why it works well for me.
 
Apalchen said:
Could I just set my exhaust on a timer to kick on occasionally?
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Yeah just get some fresh air exchanges every couple hours during lights on. CO2 levels rise when the lights are off so don't blow that out before you use it a while lol.
 
Oh you mentioned cold night temps in the winter. A good mini heat pump that has the heating as well could be put on auto would kick in to warm the room or cool the room. Or could be controlled by a wifi controller and the mode switched from cooling to heating according to a schedule...
 
I have one sensibi controller I brought with me that I can set schedules on just have to figure out how to get wifi to work in an essentially over insulated tin can.

For dehuey I want a quest either 155 or 225 depending on needs as I don't know the climate here at all(never even been to this area before house shopping) and never had a room this big. For now I'm gonna have to make due with portable units hopefully no more than 2 70 pint per room.

It sounds to me like I'm just gonna have to work my way up, which I'm good at lol. I will start with two 36k mini splits, one for each room and run my 6 lights for now. I got some old lights I can run to see if the unit can keep up with more load.
 
@Apalchen
I would get two of these and install yourself
www.minisplitwarehouse.com

Midea 48000 BTU 17.4 SEER Commercial Ducted Hyper Heat Pump AC

This Package Includes: (1) Outdoor Unit 48,000Btu ( DLCLR )AH48AAK DLCLR Features Include : Heats & Cools ( -22 F / -13 F ) Basepan Heater ( Built in) Golden Hydrophilic Fins 7yr Compressor 5yr Parts Warranty Click the Buttons below for detailed product info: Product Brochure Compressor...
www.minisplitwarehouse.com www.minisplitwarehouse.com
I had great luck with the ones I had before(burned down along with my house).
I would have bought two more for my new grow but they were out of stock when I needed them so went with some others that are SUPPOSED to be built the same as the mideas. We’ll see.
That single zone in the link has the ducted handler, which I really like, but they no longer have the duct take-off for them. The single zone with the ceiling mount works too. I have two of them back to back(pretty much) in my new 16-1000wDe setup ran at 115% each fixture.

Are you comfortable running the power to disconnects, and then to the compressors? If you are, you can totally install it by yourself as long as the linesets(from compressor to handler)isn’t longer than 25’. If longer, you’ll most likely need an hvac dude to add some refridgerant as the compressor only has enough for 25’.
 
Aeroknow said:
@Apalchen
I would get two of these and install yourself
www.minisplitwarehouse.com

Midea 48000 BTU 17.4 SEER Commercial Ducted Hyper Heat Pump AC

This Package Includes: (1) Outdoor Unit 48,000Btu ( DLCLR )AH48AAK DLCLR Features Include : Heats & Cools ( -22 F / -13 F ) Basepan Heater ( Built in) Golden Hydrophilic Fins 7yr Compressor 5yr Parts Warranty Click the Buttons below for detailed product info: Product Brochure Compressor...
www.minisplitwarehouse.com www.minisplitwarehouse.com
I had great luck with the ones I had before(burned down along with my house).
I would have bought two more for my new grow but they were out of stock when I needed them so went with some others that are SUPPOSED to be built the same as the mideas. We’ll see.
That single zone in the link has the ducted handler, which I really like, but they no longer have the duct take-off for them. The single zone with the ceiling mount works too. I have two of them back to back(pretty much) in my new 16-1000wDe setup ran at 115% each fixture.

Are you comfortable running the power to disconnects, and then to the compressors? If you are, you can totally install it by yourself as long as the linesets(from compressor to handler)isn’t longer than 25’. If longer, you’ll most likely need an hvac dude to add some refridgerant as the compressor only has enough for 25’.
Click to expand...
Yeah I have two 4 ton midea's. Had to replace the plastic squirrel cages in one a couple times and I keep spares now. They are loud as fuck and I don't feel they are truly 4 tons.
 
Like I can hear the speed controlled blower motors on the indoor units through the floor of my house at any speed.
 
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