Three types of muscles. The muscular system can be broken down into three types of muscles: skeletal, smooth and cardiac, according to the NIH. Skeletal muscles are the only voluntary muscle tissue in the human body and control every action that a person consciously performs.
Angieâs List members in 2014 reported paying an average cost of $5,230 to install a new central air conditioners, with a general price range of $4,425 to $6,025, not counting discounts many service providers offer to Angieâs List members.
1 For an 1,800 square-foot house, a new 13-SEER unit Lennox air conditioner will cost around $3,000 to $4,000, while a new 16-SEER unit will cost you about $5,000 to $6,000 for super-efficient units.2  For instance, the Lennox Merit series price ranges from $1,200 to $5,700. On the other hand, the Lennox Elite series price ranges from $2,300 to $7,000, while the Lennox Signature collection price ranges from $3,200 to $8,000. 2  In the end, the costs will greatly depend on the model; plan on spending anywhere from $2,100 to as much as $8,000 for a Lennox air conditioner.