Causyn is a very good Company and have a grate reputation on the equipment they sell maybe you shouldn't buy the lowest model my furnace and air work great and are very quiet!!
2 days after it was installed I complained it was noisy checked it basically said that is the way it is one year later inside coil leaking replaced under warranty another year later outside coil leaking parts under warranty luckily I had purchased extended warranty but I still had to pay the full deductible and for the lost Freon which would not have been lost if they had fixed it right the first time owners attitude too bad so sad but I am doing nothing for you that I do not have too