I am currently building a new grow space, room, rigid tent call it what you will starting from digging out crawl space raising walls sealing dry running. This is a limited space how to for those of you curious I have no room in my house which is discrete or suitable being a 700sqf home my only option was to dig under it.
Now first thing I did prior to digging was upgrade my electrical service from 60 amp to 200 this meant I could add new circuits through house under my permit so I added 3 to crawl space 2 dedicated plugs for lights fans and pumps. Before I started I chose my lighting 3 400 watt HID so I knew roughly my footprint needs. As it turns out I needed roughly a sheet of plywood 30 square ft. I chose a space of convenience close to entry but not directly visible from it since I knew would be digging in tight space 5 gal buckets at a time fortunately I had lots of buckets on hand lmao you’d be amazed how many buckets of dirt it can take to dig a 2 ft hole 5x6 and in tight space full size shovel picks are not options will add pictures shortly bare in mind I started taking pictures after digging tunnels to jack up house so had 16" high starting point. Currently have 42" of space enough for me to start the fun stuff.
I factored in my grow plans and plant height goals light distance etc. to get to 42" will work for me conclusion 11" res 18"-22" plants 6-10" light distance etc… still needed to remove 30" of dirt 6’x6’ my parking space grew outside quite nicely. On day 3 of this build I put up 2 walls comprised of 3" thick roofmate styro used but r-15 lapped joints free for me since my space is hardly heated and live in north need to hold warmth cooling will not be an issue simply turn up my fan which I will need to vent into crawl space with my dehumidifier running for now heat recycling and no discrete vent exits yet warm steamy air in the winter coming out of basement wall is kinda dead give away 
So this is where I currently am at will add pics shortly
It’s amazing to me some time’s how much we love our gardens , a true testament to hard work , blood , sweat and tears… Much luv buddy… Keep us posted…looking good…
I will be doing daily updates as I work on it should have walls in today and be ready for my Panda plastic this space will be split into 2 sections with a light proof vent between will be digging sepperate area for mothers and linking vents together pulling heat from mother room through this space also adding hepa filters to all intake vents
Thats freaking sweet man
All that work to grow some fresh bud, I guarantee you the first bud you smoke after all that work will be the best weed you have ever or will ever smoke. 
it’s just work and i think if you really enjoy growing you do what you need to make things work evolving and improving with each grow and or room you set up
Going to be easy to regulate heat but the humidity is going to be an issue !?
I own dehumidifier and winters here are dry and cold
if humidity becomes factor I will vent out under my deck just don’t want the tell tale plume of hot air coming out of my basement melting snow only in one area 
I have several rooms I don’t use in the winter which I shut off and plastic sealed completely, I keep the rest at 55 degrees and I augment with alternative heating and it averages around 64 degrees in the living areas
My grow room is one of these 55* areas so I use my lights and anywhere from 600 to 1600 Watts keep it toasty warm but there can be a humidity issue even with 30’s percent humidity in the winter
I’m looking for some kind of a 6 inch splitter so I can divert some or all of the heat into my floor venting which comes right out on the other side of the wall and heats my bedroom I may have to fabricate some kind of splitter if I can’t find one
I’ve seen heavy duty home humidifiers for about a hundred bucks, I think this spring I’m going to have to put a controller in too, I’ll be looking for info on that then but right now I’m going to see how much humidity I’m going to have
the lights burn a lot of the humidity off and if I can keep it 55 + heat from the lights I’ll be fine with it, it was freezing for a day the other day and I never got past 77 in the tent with 1000 Watts on, & 64 in the room
Edit: one thing I learned is never use a humidifier unless you’re in the middle of the desert because I think that’s where this leaf spot fungus came from, when I saw 30% rh I ran it around the clock and kept it around 60 and it doesn’t need to be that high
…that’s what this is all about learning right ? That’s what they say I guess, that’s why I love it here! …good to see you back, that’s quite a project looking forward to watching it come to be! 
Forward progress adding divider wall between lights was just trying to work out how to share extraction and not light came to simple answer range hood filter $12 problem solved my can filter is far too big for space. So going to push air through filter 2 issues solved at once no dust clogging my filter reduced airflow kicking up dust in super dusty space
Panda plastic rocks will paint ceiling flat white cut in some vents and add divider wall tonight was plumbing in my whirlpool tub today pain in the arse had to cripple joist crawl in the dust lots of fun wire in another circuit didn’t get as far as I would’ve liked but no sprouts yet so no rush
Nothing cool is ever easy…
Great job, I luv people that know how to get after it…
Man im really excited for you!!! I would fully do this if i owned my own home. All the best mate
Get it, this is what I would be doing if I had any basement at all
Lol I just look at it as recycling heat to help warm my house and keep my pipes from freezing during the winter
If you think about growing indoors there is very little energy efficiency involved lots of power used hourly and the main by product is heat so if I can recycle some of it rather than venting it all outside it is worth a try but the things plants like very few houses do. Humidity will still need to be controlled if I intend to vent indoors that means I have to lower humidity of vented air using additional power for dehumidifier which in turn produces more heat as well or exhaust at a far slower rate 1-2 times a minute rather than running fans fast or seal space and add co2? lmao I love good challenges but hell if people can grow in fridges and cabinets I am pretty sure I can make this happen 
Quite pleased with my tap water 112 ppm ph 6.8 out of my RO it’s 12 ppm 7 ph but have little need to use my ro with numbers like that didn’t do much work on my space today have 2 days to have my old place clean so made several trips back and forth grabbing odds and ends getting rid of crap etc.
Did track down most of my chemicals and meters in their boxes and remaining gear my fans and filter are going to be a little much for this space my res was filthy so left it out in rain over night need to wash all my smart pots the misses works tomorrow so will sneak them in hahaha… Will give them to my dad next time he’s in town. None of my ladies have sprouted yet so not in huge rush also trying new starter pellets so who know’s? I’m using coco starters pellets and a heating pad instead of my usual jiffy pellets it may or may not turn out to be a mistake? but nothing ventured right
I don’t doubt you cannot do it , in fact I like that you are using some science to serve two purposes , but can’t wait until the final setup is finish and up and running .
2 ladies come to life this morning 1 of each strain sofar