I totally understand your concerns Mr. Bloom.
Fullauto's signature quote is a good one. For me, growing pot is a form of art, and creating good art is generally a matter of working thru a series of problems.
First of all, google "BTU calculator" or "heating calculator" and sites will come up that will give you a rough idea of how much heat you need to generate to achieve a certain temperature for your room size. Get a good mercury and glass thermometer and set up the grow area with everything running except for the growing plants. Check the thrmometer 4 or 5 times per day - this wil give you a good idea about the heat holding abilitiy of your grow tent: for example, when I have 1200 watss of HID burning (the ballasts are seperated from the grow are) the room in my boathouse where I grow heats up to about ten degrees warmer than the average daily outdoor temperature; with the ballasts placed inside the grow room, the room heats up to about 25 degrees warmer that outside (I rely on the ballasts to heat the room in winter).
You do not want to have $100 in fancy seeds sprouted and growing and then discover that your lights are turning your grow tent into an Easy Bake Oven.
Secondly: odor control: pet supply shops (we have super cheap "big box" pet supply warehouses like Ryans Pet Supply here where I live) sometimes sell small air purifiers for people who want to control odors around a cat box. You might want to check out that avenue as a possible resource. Alternatively, I have read about DIY set-ups that use a small fan blowing across dryer sheets to mask the odor of growing pot.
But, to me, the problem of Wifely Disapproval is far more interesting. My wife will never take a toke - she tried in in college, didn't like it, blah blah blah. Also, where I live, there is a real risk of very serious criminal consequences of getting caught with any measurable amount of cannabis.
But I have some (successful) experience with the problem of Disapproving Wife Problem, so may I offer the benefit of my experience to you?
In short, keep the grow operation down low and work to prove to your wife that she too will benefit from your pot growing operation.
The general strategy is to grow weed on the downlow while you work to change her attitude from disapproval to minimal tolerance.
Try to keep your wife away from the gro area. When I first started growing in an old boathouse out back, I was able to keep my wife out of the boathouse for months by telling her the following story, "I have discovered termite damage in the boathouse. I refuse to use poisons (we have lots of pets) so I am going to use a carbon dioxide generator to kill the termites. Don't worry it is perfectly safe for humans and animals but it involves generating low levels of carbon dioxide for long periods of time, therefore please do not open the door to the boathouse." The Bugs-in-the-Attic strategy also allows you to attend to the grow (and carry chemicals in there) to check on "how those termites are doing".
Another time I moved our pet rabbits indoors into the back room for the summer. It is so hot here where we live that it is dangerous for rabbits to live outdoors (in temperatures above 90 degrees) so my wife understood the need to move them inside into a back storage room. I had a pretty big cage, there was hay everywhere, and rabbits pee and poop like crazy, so it got pretty filthy in there after awhile: all this kept my wife from going back there for a long time. I had a 4'x2' bank of flourescent lights hidden in some shelves behind some boxes.
Some wives tend to be natural born narcotics investigators: if they see anything suspicious, like light leaking out of a dark space, they tend to start asking accusatory questions, and they are good at recognizing lies, so be prepared with some clever - emotionally charged - distractions. For example, if she asks, "Are you growing pot in the attic?", change the subject by replying with some emotionally charged questions like, "What??? Have you been talking to your nosey, big-mouthed paranoid sister again? You know if your sister would stop worrying about meddling in other peoples' lives and face the fact that she is the world's biggest loser ..." This technique takes some planning and practice.
Be prepared to quickly disassemble and hide the whole grow operation in an emergency (obviously, this will not be good for the plants, but pot plants can handle some rough treatment and a day or two of being hidden in the dark fairly well). In the face of an unavoidable question, pretend to be 99% cooperative. For example, if your wife asks "Are you growing pot in the attic?" and if you lie and say "No", she will almost certainly say, "Show me." In this situation, you must distract and delay her. Say "Of course I will be happy to show you, but first I need to [whatever]" ... then at the first opportunity and as fast as possible, strip down the whole grow set up and stash it somewhere safe until you can safely rebuild it.
I have saved the absolute best technique for obtaining Wifely Approval for last: bribe her. MONEY TALKS. Keep a fifty stashed in your wallet for when you need it.
I used my "loyalty points" on my credit card to get a $100 gift card at Nordstrom's and kept it iin my wallet. Then, when my wife confronted me about buying a 600 watt HID (the UPS guy delivered it to the house a day earlier than expected; by this time my wife was barely tolerating the grow operation b/c she thought it was not costing much money), we had a brief uncomfortable conversation about "And how much did you pay for THAT???" I lied to her and said, "I think it was something like $95 ... but look here, the lighting supply warehouse sent me this Nordstroms' gift card as a freebie". By this point, of course, my wife had pretty much figured out what was going on - I felt obliged to keep the gift cards and flowers and other good shit flowing her way. It seemed like a good deal too: after all, that first year I spent an even thousand bucks on grow room shit so seniding four or five hundred in goodies her way seemed like more than a good deal. We never really talked about it (perhaps because she knew that I would cut and dodge and play the slippery eel everytime) but she began to grudgingly tolerate the grow op. No bullshit, as soon as my wife figured out that "gift-cards-grow-on-marijuana-plants", she got alot more tolerant.
Once my wife admitted to me that one time while I was napping she took my keys and went outside, unlocked the boathouse and took a good look around at 18 three foot tall plants.
One last thing that brought Wifey over to my side: I get really horny when I get high. This is what sealed the deal with her.
Another thing I started doing: my wife is a great fan of "Honey Do" lists. In exchange for her tolerance of my indoor growing operation, I pretty much just (fire up a few bowls and) spend the weekends trying do everything she asks me to do (altho too slowly she tells me).
I might add that growing my own pot caused two other very good things to happen in our relationship (I wasn't aware of the second benefit until she told me about it). #1 I stopped spending money on beer and started getting tons of exercise every day when I would take our dogs on looooooooong stoney 4 and 5 mile late night walks and I lost 40 pounds in four months. #2 Getting high mellowed out my personality on a daily basis and (my wife told me) I was alot easier to live with (this actually surprised the hell out of me)
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