ventilate heat into loft or another room

That's what most do.

would that not cause mold, mildew and condensation in loft? or even a heat signature to arouse suspicion

It could do. It didn't in mine and others. You are asking incredibly broad questions. For example your location could be key with regard to the isue of mould, or your grow setup could be key with regard to creating a noticeable. I'm being incredibly vague with my answers because that is the best i can do with the vagueness of the questions.

i'm sorry i will more specific i have my room which is 12x6x9

i will be using a 5x6 hps lights with standard reflectors

my window will be light tight and sealed, all the heat that will be produced from the lights how could i possibly cool it before venting it into an un insulated loft/attic

Originally Posted by nasar

i'm sorry i will more specific i have my room which is 12x6x9

i will be using a 5x6 hps lights with standard reflectors

my window will be light tight and sealed, all the heat that will be produced from the lights how could i possibly cool it before venting it into an un insulated loft/attic

Your best bet will be to vent the heat out of the house. An attic will work well also.
What wattage are your lights? If you are worried about heat signature you may want to coat your grow room with some thermal-insulating paint.

i am planning on using 600 watt hps lights with standard reflectors, and does the thermal insulating paint actually work? or should i line my room with anti detection film?
Would i need to insulate my loft/attic as the heat will be pretty hot from the what i can guess, also do i need to worry about mold/mildew and moisture etc?

Originally Posted by nasar

i am planning on using 600 watt hps lights with standard reflectors, and does the thermal insulating paint actually work? or should i line my room with anti detection film?
Would i need to insulate my loft/attic as the heat will be pretty hot from the what i can guess, also do i need to worry about mold/mildew and moisture etc?

What state...they're not using thermal imaging for your grow most likely either way...

from uk its different up here choppers allover the houses