60 degrees to low?

During the dark cycle my temps often drops into the 60s and has even been in the 50s a few times when it has been extremely cold out. With lights on temps are good 76 degrees. Should I put a space heater in the grow room during dark cycles. I have two with thermometers built in. I have Ice and Blueberry 2 weeks into flower. They look great up to this point.

it's not so cold that it will kill them...the worst it could do is maybe slow the growth a little....but if you use space heaters, set them for like 65 degrees.....

I would definately use a space heater if I were you. The temp itself isnt the problem as much as the fluctuation between 50's and 76.

I have mine set at 70 degrees and there is no more than several degrees difference between day and night.....less than 10.

props to boneman.

you won't harm them with the low temps just slow them down, thats not so good. set one of the heaters up for around 70, keep temps between 70 and 80. When you get higher than 86 the plant stops using Co2 and growth slows or stops.

Here is some info on temp and Co2.

Peace

Why All Plants Need CO2


The dry matter in a plant is 90% carbon, hydrogen, and oxygen. All the
carbon has to come from the carbon dioxide (C02) in the air.
CO2 molecules are only necessary during the light times. Plants do not need CO2 in the dark period, and in fact plants breathe out CO2 all the time, just as humans do. The slight difference is that in the light period, leaves use up their own CO2 to make sugars and so appear to breathe out only oxygen in the daytime.
The more light available to a plant, the more CO2 it needs for photosynthesis. Experiments have shown that during photosynthesis, it takes about 1 a photons to make enough electrons to create sufficient energy to split one CO2 molecule into carbon (c) and oxygen (02) atoms and form a sugar. There are trillions of photons striking the plant leaves, so a grower must provide enough CO2 or else the photons will just bounce off the leaves without doing much.
A plant in full Sunlight (about 5,000 lumens per square foot) could process about 2,000 PPM of CO2 if it was made available in a greenhouse. Outdoor CO2 is nowhere near that. Indoor gardens with the light level at 3,000 lumens per square foot need about 1,500 PPM of CO2 for the limited light. With the level at 1,000 lumens per square foot, only about 300 PPM of CO2 is required - which is less than ambient air (city air normally has 400 PPM of CO2), The lower the CO2 level, the more the air has to be kept moving past the leaves.
Remember that it is the PAR value (not lumens) that indicates the plants' use of CO2 because the light that the leaves cannot sense is totally wasted and does not go down the photon funnel to be used for splitting CO2 into sugar.
How Much Carbon Dioxide Can Your Indoor Garden Use?

Experiments have shown that plants can handle up to 10,000 PPM of CO2 with no ill effects. At very high light densities, indoor plants have a maximum CO2 uptake of just over 2,000 PPM.
Light intensity increases with closer distance, so the CO2 level around plants needs to be increased respectively:
This is with maintaining all plant resources at MAXIMUM and at a temperature NOT EXCEEDING 30°C (86°F).
* Ambient CO2 in the cities is between 400-500 PPM.
* Ambient CO2 in the country is about 300 PPM.
Note: Any time your indoor garden temperature goes above 30°C (86°F), start shutting down the CO2