About Hum Drip Hiss
Hum Drip Hiss explains what a furnace, air conditioner or heat pump symptom usually means, which checks a homeowner can safely make, and which signs mean stop and call a licensed technician.
Updated
What the site does
Hum Drip Hiss sorts heating and cooling problems by what you notice: a noise, a smell, a leak, a light, a beep or odd behavior. Each symptom page lists the likely causes with the most common first, the checks a homeowner can make without opening any equipment, a stop-and-call panel, and what to tell the technician. The site is written for homes across the United States, in plain US English.
Start with the ten-minute safe checks or the stop-and-call signs, or pick a symptom from the home page.
What it never does
Hum Drip Hiss is not an HVAC contractor. It does no installs, repairs, visits, inspections, diagnoses or quotes, and it cannot see your equipment. Only a licensed technician who examines the system can say what is wrong with it.
The site never asks readers to open a refrigerant line, a burner compartment or an outdoor unit's service panel, to handle capacitors, or to bypass a safety switch. For a gas smell or a carbon monoxide alarm, every page says the same thing: get outside first, then call 911 or the gas utility.
Hum Drip Hiss has no connection to any business that used this web address before. It shares owners with some businesses it links to; the ownership and links page explains who they are.
Where the information comes from
Facts come from primary sources: equipment makers' manuals and support pages (Carrier, Trane, Lennox, Bryant, Goodman, Rheem, Honeywell, Kidde, First Alert), gas utilities' safety pages, the propane industry's safety booklet, and federal agencies including the CPSC, EPA, Department of Energy and ENERGY STAR, plus NFPA. Each page names its sources inline and ends with a note on what it is based on and what was left out.
Where makers disagree, as they do on filter intervals or how long a frozen coil takes to thaw, the pages say so and give the cautious figure. Forum posts, contractor marketing and repair cost estimates are not used.
Corrections
Pages are re-checked when a maker or agency changes its guidance, and the date on each page shows when it was last updated. If a source page moves or changes its advice, the page that relies on it is revised to match.