When you don’t have a lot of money, you have to figure out repairs on your own. I am entirely thankful that YouTube has millions of videos. I can genuinely search online for practically anything & find a useful video that will describe how to fix something in a step-by-step process. If I watch the video 20 times, then I suppose love an expert. I was having problems with the heating & cooling system in our home. I narrowed the problems down to an issue with the control unit. I was 99% sure that I could update the control unit & that would fix the complications with the heating & cooling system. Since I didn’t want to spend a lot of money & I was unsure that the control unit would fix the issue, I bought the cheapest model at the hardware store. They had a control unit for our system that was only $39. It didn’t have a digital display or fancy buttons & it wasn’t a smart or programmable machine. It was a basic & official control unit. The control unit included step by step instruction & I also looked up a video online that showed myself and others exactly how to update the control unit. The first thing I did was shut off all of the power. Every video that I watched proposed us to shut off the power first. A lot of people must have been electrocuted before they realized that they needed to shut off the power. It was good advice. I carefully detachd one control unit & rewired the minute. When I turned on the heating & cooling machine, the complication was fixed.