What a day to find out my A/C is low on charge at my house. 79 degrees in my sons room (16 months old). I ordered 410a and pressure gauges from amazon. Just need some input, anybody work with 410a Home A/C systems? I work on car A/C (R12 and 134a) so I'm sure I can figure it out. Just wondering if there are any pressure charts online? I know I am looking for a 20 degree split, discharge is 20 deg cooler than inlet register duct and High side should not go over 200 or it will stall the compressor. Any other key points? Where is a good place to find a dye charge online and is that superseal stuff any good? If so where is a good place to find it? Thanks!