There are a multitude of reasons why lactating women pump breast milk either in addition to breastfeeding or instead of breastfeeding.
Some women are not able to breastfeed due to their babies not latching or if their baby is medically fragile.
Some women go back to work,so they are unable to breastfeed. I exclusively pump because my baby is intubated and is unable to breastfeed until she is off the ventilator. Pumping is hard work and has to be done frequently or issues can arise such as lower milk supply or breast infection. There are several things that make life easier when pumping. First, you want to make sure you are comfortable and your area is clean that you pump in. It is important that the temperature or your house or wherever you are pumping is comfortable. If you are sweating or freezing while pumping, that will cause stress and when you are stressed your body will produce less milk. I personally make sure my air conditioning is set to a comfortable temperature on my smart thermostat before I pump because I live in a warmer climate. My baby is in the NICU, so when I pump here there central air conditioning is always set between 72-75 degrees. If you are sweating while pumping, the flanges which are the devices that help collect milk may slide off so it is important that you do not allow yourself to sweat too much. If you are someone who pumps breast milk, you should get routine maintenance done on your HVAC system to make sure you can stay comfortable.