The amperage of a fuse is designed to protect the electrical circuit from overheating and causing a fire. A 5 amp fuse is designed to handle up to 5 amps of current, while a 10 amp fuse is designed to handle up to 10 amps of current. If you replace a 5 amp fuse with a 10 amp fuse, the fuse will not be able to protect the circuit from overheating, and a fire could result.
In addition, using a fuse with a higher amperage than recommended can damage the equipment that the fuse is protecting. For example, if you use a 10 amp fuse in a circuit that is only designed to handle 5 amps, the fuse will not blow when the circuit overloads, and the equipment could be damaged.
For these reasons, it is important to only use fuses with the correct amperage rating in your heating and AC unit. If you are not sure what amperage fuse you need, consult with a qualified electrician.
