Did you add an oil charge to the system when you recharged it and did you recharge the system using refrigeration gauges. The system may be low on refrigerant oil or you could have overcharged the system causing the compressor to have to work too hard.
its probably your radiator
A hummingbird
id say type and size of tire, and if bearings are bad either or will make that humming sound.
A Humming bird Benefits from Drinking the flowers because the flower comes like food to the Humming Bird.The flower Benefits from the Humming bird because the humming Bird pollinates it.
Pascagoula river
The heater makes a humming sound.
it could be your tires on the pavement.
Nectar makes up 90% of humming birds diets.
Sounds like too much has been freon added. have it checked when cold. Too much will ruin and/or lock your compressor. Your problem is possibly the Orifice valve. About $3-5/00, 100 Labor. David That was $3.00 to $5.00, and $100.00 Labor (and new freon. It should hols around 3 12 ox cans. If too much Stop Leak or Leak Detector has been added, you have probable stopped up the orifice. David
Mitsubishi.
try humming and calming down and take pauses in a sentence
it does that because it has a generator which makes the engine makes these sounds