I have an older HVAC system in my house. I'm assuming it's the original system, so we'll say it's 40 years old. We've been going through a heat wave the last week or so with outside Temps above 100 degrees. My AC will run non stop and will not cool lower than 77 degrees. Last year it would have a hard time cooling below 74 (I think). It seems like every year it's getting gradually worse. I'm not an HVAC guy, but I have checked the basics. I have a new air filter. Air flow out of the vents is good. The outside unit is running. The fan runs well and is pushing air through it (I think the blades might be a little low on the motor shaft and not pulling enough air, but it's always been that way). The air coming out is hot. The compressor sounds good to me. No unusual sounds coming from it. And when I touch the suction line at the condenser, it's cool. The discharge is really hot. And if I touch the suction line at the evap it's cool. And the discharge is hot. This system uses R22 so I don't have gauges to check it, so I don't know what pressures are.
What does this sound like to you guys? I'm not replacing this system because I don't have the money to do it. It needs to hold on for a few more years until I can afford it. I'm hoping it just needs a charge or something. I'm hoping to learn a few things from this so I can expand my knowledge.