Please don’t tell your brother about the HVAC system.
If he showed up when the HVAC system was being installed, he would want to be helping the HVAC techs remove the ductwork and the old HVAC system
When we ordered our mini split ductless HVAC system, I asked my husband not to tell his brother about the HVAC system. I wasn’t trying to keep it a secret, but I knew how my husband and his brother were. If his brother came over while the boxes were still in the house, they would be opened. Once those boxes were opened, neither me nor God would be able to stop them from playing with the parts and considering installing one or all of the HVAC units. He gave me a dirty look, but he couldn’t understand what the big secret was about. I told him to invite him and his wife over after the mini split ductless HVAC system was installed, and they could experience its heat and air conditioning with us. I then reminded him what happened when they delivered our 75 inch television set. They took it out of the box, and broke the screen while trying to figure out how to use the touch screen gaming system that was already installed. The entire television set had to be factory reset by the people who were to set the television up for us. I didn’t want this to happen with our new HVAC system. If he showed up when the HVAC system was being installed, he would want to be helping the HVAC techs remove the ductwork and the old HVAC system. I just thought the entire process would go easier if he and his brother weren’t in the house together. As much as he didn’t want to, he agreed with me.