ok well we all know that co2 is good for are plants. but what is the better way to go? tank or generator? in the long run which one coast less and works the best.

lets hear it people, what do you have to say in your experience...
a little side note. if anyone knows how to build or even knows how a generator work that would be great(cheaper to build your own i think)

Okay, it depends on a lot of things.

I wouldn't suggest building your own generator. Yes, it is just a propane grill, but it has a safety tip over switch and an auto pilot that'll keep you from burning down your garden.

The main issues are, heat and ventillation. If you're already having a heat problem, use a tank.

Although you CAN run higher room temperatures with co2, around 95, try to keep it comfortable, because the soil, or water needs to stay cool.

If you are venting a lot of air from the room, you will loose a lot of precious co2.

I'd recommend a co2 controller with fuzzy logic for a tank system, and an on off system for the generator.

Cost wise, a 20 lb co2 tank and a normal propane cylinder cost 20 bucks, and they last the same amount of time.

Co2 tanks require you go to a welding supply warehouse, while propane is at most gas stations.

If you have heat problems use a tank, if you don't use a generator.

I forgot to mention, co2 works by flowing over the leaves surfaces. If you spend some time in your garden, the air you breathe will feed the plants.

I noticed this while working in my garden, the fuzzy logic would keep reseting itself, adjusting to the room, and eventually stop completely. i then noticed the meter was reading 2600 or something, and i sort of freaked out looking for a leak in the valve or something... later learned it was just because i was in there working... duh.

+ rep for taking the time to give a full answer. helped me alot.

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No prob. On a side note, generators create carbon monoxide, and warn you not to use them indoors...

Besides who needs more combusted chlorofloracarbons in there already smokey house.

U can use a CO2 generator with natural gas. Run a line from your household gasline and you never have to refill anything.
With any generator (naturals gas or propane) you are going to need an ac unit.

Good point, if you have natural gas, i only knew one person to do that, most people are afraid to mess with their gas lines, and can't get a professional to do it for them.

I'd say generators are best for greenhouses, or large rooms.