The pressure transmitter comes in a number of shapes and sizes. One, referred to as a Bourdon Tube, is designed especially for monitoring non-liquid pressure. They are relatively inexpensive and good for measuring air and gas pressure in compressors. The tubes may be c-shaped, spherical and helical.
Average Pay & Benefits. The BLS groups heating technicians under the job category of Heating, Air Conditioning, and Refrigeration Mechanics and Installers. These technicians earned average incomes of $45,540 per year as of May 2011, according to the BLS. Their incomes are based on both regular and overtime pay.
1 What is the average annual salary for HVAC Mechanic I?  How much does a HVAC Mechanic I make? The median annual HVAC Mechanic I salary is $42,018, as of July 29, 2016, with a range usually between $36,079-$49,342, however this can vary widely depending on a variety of factors.