This is Antminer T15
It's good -14 here in Finland today. I was sure the T15 wont boot at -10 but it's just very very slow at booting up. This unit takes 30 minutes to load. While watching the kernel log it goes trough some long checks to overclock the ASIC boards and check everything. Ambient temperature is roughly -7c I don't know if it doesn't like cold start.
2019-01-03 16:44:50 driver-btm-soc.c:7811:bitmain_soc_init: Open 1/4 core for reading temperature.
2019-01-03 16:44:50 driver-btm-soc.c:3946:open_core_BM1391_pre_open: pre open core = 16
2019-01-03 16:44:51 driver-btm-soc.c:3921:pre_open_core_one_chain: for chain 0
2019-01-03 16:44:51 driver-btm-soc.c:3921:pre_open_core_one_chain: for chain 1
2019-01-03 16:44:52 driver-btm-soc.c:3921:pre_open_core_one_chain: for chain 2
2019-01-03 16:44:52 temperature.c:240:is_tempsensor_data_correct: Bad,temp_info.type = 0
2019-01-03 16:44:52 temperature.c:356:calibration_sensor_offset: chain[0] temp info,Bad. Reload from eeprom..
sensor type = 0,sensor num = 4
sensor pos: 15 11 45 41 0 0 0 0
sensor offset: 0 0 0 0 0 0 0 0
2019-01-03 16:44:52 temperature.c:382:calibration_sensor_offset: chain[0] temp chip I2C addr=0x98
2019-01-03 16:44:52 temperature.c:240:is_tempsensor_data_correct: Bad,temp_info.type = 0
2019-01-03 16:44:52 temperature.c:465:calibration_sensor_offset: Warning: Chain[0] has no temp info ! we will fix it
2019-01-03 16:44:52 chip1391.c:723:set_misc_control: cmd_buf[0]=0x41093818, cmd_buf[1]=0x6131, cmd_buf[2]=0x2000000, misc=0x6131
2019-01-03 16:44:53 temperature.c:487:calibration_sensor_offset: Chain[0] use default temp chip[14]
2019-01-03 16:44:53 temperature.c:496:calibration_sensor_offset: Chain[0] Chip[14] get middle temp offset=-5 typeID=55
*update* This is full log of 22minutes Antminer T15 boot.
https://pastebin.com/LPaXp2CaIncrease frequency to 510.00M
2019-01-03 17:05:50 driver-btm-soc.c:5982:set_timeout: freq 510 final timeout=462
2019-01-03 17:05:50 freq_tuning.c:1779:freq_tuning_pre_test_for_user_mode: Pre-test: done.
2019-01-03 17:05:50 freq_tuning.c:2840:do_pre_test_for_user_mode: [b]Pre-test cost 1170s.[/b] [b]<---20minutes boot[/b]
2019-01-03 17:05:51 power.c:439:get_chain_voltage: chain[0], voltage is: 15.99
2019-01-03 17:05:52 power.c:439:get_chain_voltage: chain[1], voltage is: 15.97
2019-01-03 17:05:52 power.c:439:get_chain_voltage: chain[2], voltage is: 15.99
2019-01-03 17:05:52 power.c:462:get_average_voltage: average voltage is: 15.98
2019-01-03 17:05:52 driver-btm-soc.c:7889:bitmain_soc_init: Init done!
Power 1563W
Temps and pictures with 24H of mining done at -7
Fan Speed (r/min)# fan1 2640 fan2 2880
the psu fans have high pitch noise. They are crazy rpm small fans. The big fans really move some air but they are loud. So loud cant live with it or neighbour will complain. 
