Frederick Air, Inc
3 King Avenue
Frederick, MD 21701
Phone: (301) 663-0300
Fax: 301-662-1042

Business Hours: 8:00am to 5:00pm

Evening and Weekends Available by Appointment

Need a Service Call or New System Installation?

We want to make it affordable and easy to have your HVAC equipment serviced or repaired. Should you need a new AC installation or a new heater, we'll work with you to stay within your budget.

Our knowledgeable staff is ready with the latest information about programs that you can take advantage of to save you money on new heating and cooling equipment for your home.

Call us today to discuss our flexible financing options. Keep your system running in tip-top condition and stay cool and comfortable all year long.

Be sure to print out our Internet coupons where you can find money-saving discounts on products and services.

Save Money On Air Conditioning

Call Us: (301) 663-0300


24 Hour Service

Our friendly technicians are available 24 hours a day for your emergency service needs. Simply give Frederick Air, Inc a call, day or night, and let one of our technicians help you with your problem. We are always here to assist you.

Low-Level CO Detectors

This information is for customers who recently purchased a low-level CO detector. If you would like information on the Dangers of CO in your home, please click Here


Your detector is designed to provide the consumer with very, very early warnings of the presence of Carbon Monoxide, thereby eliminating the PANIC and the need for and immediate call to 911 for a trip to the hospital, and far too often the need for Hyperbaric oxygen therapy treatment. This CO Detector is designed to put you in control of, not at the mercy of Carbon Monoxide Poisoning.

What you need to know about your Detector

Warning Levels:

0 to 6 ppmNo Warnings

7 to 24 ppm1 series of 4x4 beeps once a minute

25 to 34 ppm1 series of 4x4 beeps every 30 seconds

35 to 49 ppm1 series of 4x4 beeps every 20 seconds

50 to 69 ppm1 series of 4x4 beeps every 10 seconds

70ppm & Higher1 series of 4x4 beeps every 6 seconds

What you need to do if the alarm goes off:

(In all cases depress the Hush Button for 8 seconds to silence alarm)

Check Display

Display shows:

000No response needed, inform Frederick Air

7 to 24 ppmHush alarm, monitor closely and inform Frederick Air

25 to 49 ppmHush alarm, open windows and immediately call Frederick Air

50 to 70 ppmHush alarm, immediately call Frederick Air, watch display closely

If display rises to 90 ppm , call 911, exit at once & move to fresh air.