My first SpaceBucket

Feel like due to the weather taking such a change, night time temp has dropped. I either have 2 options, buy a lizard style heat mat to place under the bucket or still buy the pad and harvest. The bucket would be modified, bulbs removed, plant/pot remved. Leave the fans running and place the heat pad at the bottom of the bucker. The pad would be at the lowest point, the hot air would rise and hit the first set of fans at around 20/25cm higher. The bud would be hanging from around 30/35cm from the base then a final top fan sucking air out and into the carbon filter. The leaves are turning purple from the smaller stems and slowly on the larger ones, I have seen this could be low P levels (on the flush so would kind of make sense) and also cold weather which also fits. Trichnomes almost 47.5%/47.5% split between white and milky, with the remaining 5% being amber, mainly on the lower stems/bud sites. The cold is also causing me concern it's stopping to 10c in the evening and can't bring the bucket into the main house. From planting, on day 93/ week 14 as of today (09/11/2019) I think the biggest thing is, will she be ok to harvest in the next day or 2?