We are planning to replace the furnace and AC which are both over 30 years old. Our house is a two-story colonial with about 3,200 sq feet in size.
The heating is mostly ok. But AC wasn't adequate in summer: it took forever the drop even one degree in temperature. What's worse is that the second floor was too hot most of the time.
One contractor said that a single-zone AC will always be a problem in a house this size. (And it faces West.) Is this true?
In the meantime, another contractor said today's variable speed furnace reaches further in the house and the second floor won't be a problem.
We have decided to put in a variable-speed furnace but have a tough decision to make on the AC. Should we make a straight replacement or put in a smaller unit and add another unit in the attic (plus the duct work) just for the second floor to make it a two-zone?
Ultimately two-zone AC will be more comfortable but the cost is much higher. We are not sure what to do. Any advice?