I'm saying even if the outside air is 90f, it's better than 120+ off the bulbs. So in summer it's sucking from outside, and blowing outside. None of this air enters the grow or even the house. So even if the air is hotter than the room; it's cooler than the bulb, it's a closed system. So this system is running a fan on high, the [separate] carbon filter is just enough to let the plants breathe and control infrared heat.
That's how I was able to run only 7f above ambient with a fair bit of wattage.
I think you are confused on vented hoods, they save a shitload of electricity.
You lose a tad of light intensity, but you can run way more power. I don't have exact figures but you can almost cut the temperature above ambient by half, even if the inlet air to the hoods is way hotter than the room can be.
My LED's of 20% less wattage produce the same room temperature as vented hoods with hps.
Just like saying a ceramic heater is 100% efficient. Cool, but a heat pump can be 300% efficient in the same way. It's not reducing/increasing heat; it's *moving* heat. the fan moves away 2/3 of the heat with say 100w, and the air conditioning uses at minimum 350w with a startup spike of >3x that.
A window ac of 5-8k BTU is like 2,000w startup, and 500w running. Maybe some variable fancy ones draw less.
I like to run cheap undersized units at a 100% "duty cycle" so they only start up once.
if you wanna save money on air conditioning ; buy a small one and have it never shut off.
Evaporative coolers only work in the desert. Like cactus and tumbleweeds 5% humidity; dry. Plus, the plants are sweating anyway.
I used to grow 2lbs/mo with an 80-100amp breaker for the whole house, buried cable couldn't handle any more. Hot water, tv, ac, PlayStation, heat.... Every last watt counted. Had to shower before 5pm if you needed hot water later.
our fuckin air pump was a space and a water heater; all in one!
The hoses would be hot enough to require safety wire.
