Enough ventilation?

[Gary Laser Eyes]

Most of the time I just keep my window open a tad the room is a decent size and there's nothing in it besides the plants however I have a fan I could put in the window. I just wouldn't want to starve them of fresh oxygen and possibly stunt them.

 

[Gary Laser Eyes]

I also have the room at about a little above 70 is that a good temp?

 

[Trichome farmer]

I also have the room at about a little above 70 is that a good temp?

68-82 thats the area to aim for

 

[BII]

The amount of gases (O2 and CO2) consumed or excreted by the plants is insignificant, particularly in the context of the open window. People consume way more O2 and put out CO2, and have no problems living for long-times in closed spaces, whether bedrooms with windows and door closed and no other air input/out, or well-sealed houses (with there seemingly always being some leakage).

 

[AutoWonders]

Most of the time I just keep my window open a tad the room is a decent size and there's nothing in it besides the plants however I have a fan I could put in the window. I just wouldn't want to starve them of fresh oxygen and possibly stunt them.

As long as you have an incoming fresh air source, you will be fine. You should think about raising the temp though.

 

[Gary Laser Eyes]

As long as you have an incoming fresh air source, you will be fine. You should think about raising the temp though.

Yeah I have a heater that comes on when it goes below 70 I should probably put it on 75

 

[Simplicio]

Yeah I have a heater that comes on when it goes below 70 I should probably put it on 75

Most heaters have poor thermostats that allow large temperature variations.
This will control a heater, and keep temp within 1 F of what your want.
Amazon product

Higher temperature will lower humidity, and might require a humidifier.
Top fill, ultrasonic are by far the best, and this is a good one:
Amazon product

If your grow space is in a basement or inconveniently located, this will allow remote monitoring of temp and humidity.
There are internet versions available.
Amazon product

 

[Gary Laser Eyes]

Most heaters have poor thermostats that allow large temperature variations.
This will control a heater, and keep temp within 1 F of what your want.
Amazon product

Higher temperature will lower humidity, and might require a humidifier.
Top fill, ultrasonic are by far the best, and this is a good one:
Amazon product

If your grow space is in a basement or inconveniently located, this will allow remote monitoring of temp and humidity.
There are internet versions available.
Amazon product

I thought high humidity was bad and caused mold? I'm guessing that only when its drying

 

[AutoWonders]

I thought high humidity was bad and caused mold? I'm guessing that only when its drying

In general....
Veg humidity 50% - 70%
Flowering Humidity 50% - 60%
End of Flowering Humidity 40%