what is the noise on my central air unit?

Question

i recentley had purchace&replace a fan motor and condencor on my central air unit outside it was wired correctly and replaced correctly,it cools good and cut on and off when supposed to, but while its off it still hums not real loud but lightly and its not from the fan i think its from the transformer.is this normal after repacing a motor ? and is this humming causeing my electricity bill to go sky high

Answer 1

transformers will hum some, as long as there's power to it, it may also be the freon equalizing its self after the unit ran, keep check on the light bill, if it jumps then it may be the transformer, breaking down,