If you see dampness or frost you need better roof ventilation and some attic vents.
Refurbish old house vented attic now heat and air consdition.
An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan.
Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.
Told that the 2 attic power vents are the only attic ventilation i have the house does have vented soffits every other soffit cover is vented.
Attics and heat the condenser in your air conditioner works hard to get rid of heat and pressurize refrigerant for the return trip through your house.
My idea is to vent the build up of hot air that has risen to the ceiling in the hotspot rooms into the attic so that air from cooler parts of the house can move in.
So why put an hvac system up in the attic at all.
Well mainly it s a way to save space.
Attic hvac systems save space.
Low cfm similar to a bathroom vent 300cfm and only in the hot spots basically by adding an inline ducting fan to the return ducts for the hotspot rooms.
One static vent style is the turbine vent which uses wind to power its enclosed fan all it takes is a light breeze to rotate the blades and suck heat out of the attic view example on the home.
Help purchased home 8 years ago with 2 power attic vents.
Air flows in through the soffit vents and out through the roof vents.
Put it in an attic full of blown insulation.
Noticed one of the attic vents was not working.
Things have been ok low energy bills house very comfortable.