Typically, they do 1-2 years of internship. Unlike psychiatrists, psychologists are also trained in giving psychological tests (like IQ tests or personality tests). Because of their medical training, psychiatrists can prescribe medication -- probably the most commonly known distinction between the two fields.
1 For a 1,000 square foot home, the cost of an HVAC system is $6,000 to $12,000, including a new furnace, air conditioning unit, and ductwork.2  For larger homes and more complex setups, however, the price could be significantly higher. For central air-conditioning, youâll pay $3,000 to $5,000 and up for a 2,000 square foot home. 2  A new furnace in a central heating system costs $2,500 to $7,500 or more.
Installing a Trane central air conditioning system in a home ranging from 800 to 2,000 square feet can cost anywhere between $2,100 and $10,000, as of late 2009.Having to install ductwork will generally double the cost.rane has several models of air conditioners available to consumers. Some of the more popular models are the XL20i, the XL15i, the XR15 and the XB14. Each type of Trane air conditioner offers certain benefits and is ideal for certain applications.