People used to suffer throughout the summers because there was no such thing as air conditioning, but times have changed. Being comfortable all during the year is important, but it can become expensive. Cutting costs when heating and cooling appliances go bad is just one more upgrade for a modern home that can save in the long run. Turning the thermostat to a more reasonable setting might not break the family budget, and being able to share space in comfort could make being home more pleasant.
There are still homes without air conditions, but most modern houses are built with HVAC systems that cool in the summer and heat in the winter. The cost of conversion might seem high, but an integrated system could save energy. Being able to cool or heat the entire structure from just one control unit is a plus, and spending less time with trying to pare down the budget could make life better.
An upgraded system is generally much more energy efficient that the previous generation, and they save money during their operation. Compressors for cooling work with less energy to create that pleasant breeze wafting through the home, and the heaters do not need to work as hard to make sure they keep the temperature toasty during cold spells.
While they do use less energy in operations, the savings continue with the control units now available. Many of them can be programmed for energy savings while no one is home, and it can help save costs over time. It can even extend the life of the system because it is working less time while the occupants are away. Being able to vary the times when heating and cooling are really necessary can be a good way to stop playing with the thermostat and driving up the cost of comfort.