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Higher pressure in colder weather
We are experiencing the first cold weather (low 20s during the day and single digits to low teen overnight) since I installed the low pressure gauge. To date, with daytime temperatures in the 30s and overnights in the 20s, I have found that I generally run for 18 minutes per hour at a maximum pressure of 0.05 psi. This week I have been running a bit longer (18 to 20 minutes) every 42 minutes. I have also found that the pressure is significantly higher (0.8 to 1.5 psi depending upon run time). In warmer weather the radiator vents do not generally close. Now they are closing and that is when I am seeing the pressure rise.
is this change in system operation simply due to the radiator vents closing?