HVAC/Ducting question. BRJr. needs some input

[BongRipkenJR.]

Okay, so Norcal is heating up and my room is starting to get a bit hotter. I dont want to run a portable AC because I dont want the added electricity. However the room has a 6" duct running from the HVAC unit in the attic space. This room is the farthest room from the unit and doesn't get as cold as the rest of the house. If the rest of the house is at 78 it is at 80. Can I use a duct boosting fan in the duct to pull more air and significantly cool it off quicker, or will it not be a noticeable change?

I have to get it cooled off quick! I don't know how daytime temps of 84 and night time temps of 70-74. I am not running co2 either.

 

[wco68]

If the other runs have dampers in them,you could just damper them off to push more air to that run. might same u a few bucks.if theres no dampers in the heat runs u can damper the registers.

 

[BongRipkenJR.]

The ducts in the roof space are glued to the unit and the vent box in the ceiling of the room. I was gonna put the duct booster on the end of the duct vent. I dont want to spend too much money on dampers. If the ac is running i just want more air flow to be drawn through that vent, with minimal money spent :/

 

[wco68]

so your duct work goes into the attic from the first floor or is the whole unit in the attic.there should be a pleatume on top of the furnace and heat runs running off of it the dampers should be right there. if they put them in. or the registers that are on the ceiling uu can damper down like bath rooms u can complety close because the rooms are small and uwally the doors are left open.sence ive been in the buisness for many years its easyer to know what im looking for.

 

[BongRipkenJR.]

Yeah, I have closed all the unnecessary vents. This is a single story 18 year old 2 bdr and 2bth house. It is a tract home pretty much. It has a HVAC unit in the attic space. With the A/C on I want to pull more cool air through it. My grow room is a western facing room and gets super hot in the afternoon sun. I pretty much need to turn the A/C on about 30 minutes to an hour before the lights come on at 8pm to cool the room down. I hope a duct booster can pull enough air to cool it down. Maybe I will just have to close all of the ducts in the house and turn it on. lol, unfortunately I dont live there, I just grow there.

 

[gdtrfb]

if you can get a squirrel cage type duct booster, it might be worthwhile, but the 'rotary fan blades in the middle of a piece of 6" ducting' fans you see at big box home improvement stores are for shit when it comes to CFM.

considering nothing lives there but the plants...yah, i'd probably just make the rooms the plants are in the only ones that are climate controlled. i'd also be the goofy bastard that would do this at the heat/ac ducting manifold rather than closing vents on the far end of the run, too, tho...so there's a grain of salt to contemplate re: my opinion for a minute, too

 

[BongRipkenJR.]

Thanks guys! I had my lady's mom set the ac for 76 degrees. It dropped the temps in the grow room from just under 83-79 degrees. I am cool with that as I have plenty of air movement. I really just dont want to buy an air conditioner and waste the electricity.

 

[messn'n'gommin']

A shade tree (lol...may take a while), window awning, running your lights at night, a booster fan, larger ducting for just that run, and damping the other runs (choked down, not closed) will all add up. I don't think I would close off completely all the other registers, though.

 

[BongRipkenJR.]

There used to be a shade tree, but it rotted and she had to remove it. I was gonna get a booster fan this weekend. Dampers for the other runs would cost more than a portable A/C unit.

 

[RedRain]

well i dont think a duct booster will help you at all

first off your thermostat that is prob on your main floor is what triggers your AC on and off. So it wont matter how hot your room gets, cause as long as your house is cool your ac wont turn on.

it would be way less effecient to run your home very cold to cool 1 room. 1 little vent will not feed your room this way.

Also you arent sucking warm, moist air from your hot room into the AC. An AC conditions the air removing heat from it. You can try pushing a tiny amount of cool air from your central AC system, but I think you are wasting your time.

Buck up and run in and outs, or go with water cooling.

 

[BongRipkenJR.]

well i dont think a duct booster will help you at all

first off your thermostat that is prob on your main floor is what triggers your AC on and off. So it wont matter how hot your room gets, cause as long as your house is cool your ac wont turn on.

it would be way less effecient to run your home very cold to cool 1 room. 1 little vent will not feed your room this way.

Also you arent sucking warm, moist air from your hot room into the AC. An AC conditions the air removing heat from it. You can try pushing a tiny amount of cool air from your central AC system, but I think you are wasting your time.

Buck up and run in and outs, or go with water cooling.

Haha, it was 90 degrees yesterday and before the lights went on I switched the AC on for 30 minutes. It cooled the room from 84 to 79 and then chilled there the rest of the night. The room just radiates heat all night from the western sun, so dropping the temps before lights on, keeps it cool throughout the night.

It worked! Na na nana na!

 

[LittleAmsterdam]

I'm having the same problem right now too. Hot summer nights are coming ! Time to turn off the lights....

Are you running CO2?

 

[driftersmokinjo]

You could get some reflective bubble wrap insulation and line the west wall. That will help. Add some insulation bats in the attic over the room. Ya gotta kill the heat where it enters the room or you are just spinning your wheels

 

[BongRipkenJR.]

Yeah it is just the west facing wall. The house is actually very energy efficient, but that wall gets full sun! After I chop down in 25 days I am going to put up mold resistant 2" insulating foam board on the walls. Right now I guess the AC will keep everything cool enough if I run it for 30 minutes before lights on. The days like today(93degrees) where the AC will run all day, wont be a problem. Thanks for the help guys!

I aint turning off the lights. I will actually turn on more after this harvest After this harvest I will have a portable A/C helping the central A/C.

I am not running cO2 either. Maybe next run, but I wanted to get this run dialed in and running perfectly before I did added cO2.

 

[FreedomFightr]

you can run hotter temps with cO2.

 

[BongRipkenJR.]

I know, but by next run it will be up to 100 degrees during the day. The co2 requires a bit more money than I have to put into the room right now. I have rocked cO2 on past grows and the only way to do it is with a controller and monitor and I dont have the cash for that right now. I would also have to reconfigure my exhaust setup and rely heavily on a portable A/C unit because a window unit is out of the question. The west facing wall and window face the street. The room itself is rocking quite nicely except for the high ppms in my run off, but I flushed nicely. The shitty thing about Canna is you can't really control your N levels. I was getting a N toxicity even dropping the Coco A down quite a bit. So I think this flush smooth things out a bit.

Behind that panda film are 2 windows. Both of them are covered by black out material and 2" thick mold resistant heat blocking foam board. It works great! Without it my temps would easily be 5-7 degrees higher.

 

[RedRain]

Haha, it was 90 degrees yesterday and before the lights went on I switched the AC on for 30 minutes. It cooled the room from 84 to 79 and then chilled there the rest of the night. The room just radiates heat all night from the western sun, so dropping the temps before lights on, keeps it cool throughout the night.

It worked! Na na nana na!

ha i was simply explaining how it works..

you have no control over your room temps with the temp prob being on the main floor of your home (the thermostat) or even for it being outside the room. I also think its a waste of resources and money to run a whole house AC for one room. Whatever floats your boat!

 

[wco68]

so your going to go with a portable ac now? that will probley be your best bet.

 

[BongRipkenJR.]

ha i was simply explaining how it works..

you have no control over your room temps with the temp prob being on the main floor of your home (the thermostat) or even for it being outside the room. I also think its a waste of resources and money to run a whole house AC for one room. Whatever floats your boat!

lol I was just razzing ya. The thing about the grow room being too hot it usually means the rest of the house is around 82+. The house A/C is used to cool the house because it is hot, not wasting anything. Summer is showing its head here and there, and on those hot days the central A/C cools down the room just fine