How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manufactured and modular homes
HEATING AND AIR CONDITIONING
Tuesday, May 8, 2018
Here’s links to a collection of our blog posts about HEATING AND AIR CONDITIONING:
• Why is the base of the gas flue at the roof red?
• How do I understand the air conditioner or heat pump condenser label (data plate)?
• Why does the "AUX HEAT" (auxiliary heat) light keep coming on at my thermostat, even when it's not that cold outside?
• Does an old air conditioner use more electricity as it ages?
• Where is the air filter for my central air conditioner and furnace? I can’t find it?
• How can I tell whether the condenser (outdoor unit) is an air conditioner or heat pump?
• What is the required clearance for access and working space in front of a furnace or air handler?
• What is the difference between an inverter heat pump air conditioner and a conventional one?
• What is the minimum slope of a flue connector for a gas furnace or water heater?
• Will installing a special ultraviolet (UV) light in the air conditioning system kill mold?
• How did homes stay cool in Florida before air conditioning?
• What is the small pipe sticking out of the eaves/soffit under the roof overhang?
• Can I run a window air conditioner on a portable generator?
• How much cheaper is it to heat a house with a heat pump versus an electric furnace or baseboard heater?
• What is causing the outdoor unit (condenser) of my air conditioner to shake?
• When is it acceptable to use indoor air as combustion air for a furnace?
• How can I find out the size of my air conditioner?
• What does a "heat pipe" do in an air conditioning air handler?
• Why has the thermostat screen gone blank?
• Why can't I use my home's central air conditioning system to cool the garage?
• Does the condenser (outdoor unit) SEER rating determine the SEER of an air conditioning system?
• Why is my bathroom vent fan not exhausting enough air?
• What is the minimum height of a ceiling fan above the floor?
• When should I switch the thermostat to EMERGENCY HEAT for my heat pump air conditioner?
• What is a FanRecycler and AirCycler?
• What is a ductless mini-split air conditioner?
• Is a furnace allowed in a bedroom, bathroom, or an adjoining closet?
• Does a half bathroom (no shower or tub) require an exhaust fan?
• What are the Florida Building Code Energy Conservation Code requirements for installing an air handler in the attic?
• Why does it take so long to cool a house when an air conditioner has been off for a while?
• Why is using a stud cavity or joist space as a return air duct a bad idea?
• What is a return air plenum for a furnace or air conditioning system?
• Why is my air conditioner not cooling enough?
• How can I tell if an air conditioner uses R-22 or R-410A refrigerant?
• Why do the lights dim when the air conditioner starts up?
• When does the ban on R-22 air conditioning refrigerant take effect?
• Can the return air be in the same room as the gas furnace?
• What color should the flame be in a natural gas furnace?
• Why is it bad to have a clothes dryer vent near an air conditioning condenser (outdoor unit)?
• Why does an air conditioner condenser unit need to be level?
• How can checking the fireplace damper reduce energy bills year-round?
• Which one is better for a home heating system: electric or natural gas?
• How can I fix rooms that are too warm or too cold in my mobile home?
• What are the ventilation requirements for bathrooms and kitchens in mobile homes?
• What are the most common problems with wall/window air conditioners?
• Why is there a wall switch next to the furnace or indoor unit of the air conditioner in the garage?
• How much will I save on my utility bill if I get a new higher SEER air conditioner?
• Will closing doors reduce my heating and cooling costs?
• Should I have a return air vent in the master bedroom?
• What is the purpose of the vent grille over the bedroom door?
• Is it acceptable for an air conditioning condensate drain line to terminate under the house?
• Should I remove an old whole house fan or keep it?
• What is the SEER of my old air conditioner?
• How can I find out the SEER of my air conditioner?
• What is the best air conditioner for a mobile home?
• What size air conditioner is right for my mobile home?
• Why does the air conditioner condensate drain line need a trap in it?
• What is the average lifespan of an air conditioner?
• What does the HSPF of a heat pump system mean?
• What is an air conditioning heat recovery system?
• Can a bathroom exhaust fan dump air (discharge/terminate) in the attic?
• What are the requirements for bathroom ventilation?
• My air conditioner outside unit (condenser) won't start and is making a humming noise. What's wrong?
• Should I move my air conditioner into the attic?
• What is the right MERV number for my air conditioning filter?
• Why is my air conditioner running constantly?
• Is it alright to close the air conditioning vents in unused rooms?
• What is the "temperature split" of an air conditioning system?
• What is a "ton" of air conditioning?
• What is the difference between the SEER and EER rating of an air conditioner?
• What is a TX valve or TXV for an air conditioner or heat pump system?
• How does a hydronic heating system work?
• What is the minimum SEER rating for a new air conditioner?
• What is the difference between a heat pump and a cooling air conditioner?
• My air conditioner won't come on after changing the air filter. What's wrong?
• What is a geothermal heat pump?
• What is wrong with an air conditioner when the air flow out of the vents is low?
• Why are some rooms colder or warmer than others?
• Will a house without air conditioning pass a 4 point inspection?
• Why is there mold around the air conditioning vents?
• What does an ultraviolet air treatment system do?
• What is an air conditioner for a mobile home called?
• The coolant line to the outside unit of my air conditioner is frozen. What's wrong?
• What does "AUX HEAT" and "EM HEAT" on my thermostat mean?
• My air conditioner won't turn on. What's wrong?
• What is the difference between the "ON" and "AUTO" settings on my thermostat?
• What does the “SEER” rating of an air conditioner mean?
• What does the MERV rating number on an air conditioner filter mean?
• What does the "AFUE" rating of a furnace mean?
• How can I prevent mold in my Florida winter home when I'm gone for the summer?
• How can I check to see if my bathroom exhaust fan is actually working and moving air?
• My bathroom is stinky and humid even though it has an exhaust fan. What can I do to fix it?
• Is pipe insulation flammable?
• Can the disconnect box be mounted directly on a heat pump or air conditioning condenser?
• What is a Durozone dial-type switch used for?
• How do I set a humidistat in Florida?
• Why is there an air conditioning vent (register) outside on the ceiling of the porch?
• When is an auxiliary drain pan required under an air conditioner indoor unit air handler?
• Why is the mini-split ductless air conditioner installed in a sunroom enclosed with acrylic plastic windows called a “dehumidifier” on the building permit?
• How can I tell if my air conditioner uses freon?
• How did people stay cool in Key West before air conditioning?
• What are the problems with underground return air ducts?
• What temperature is too cold for a heat pump to work?
• What are the exhaust fan requirements for a mobile home bathroom?
• What are the exhaust fan requirements for a mobile home kitchen?
• How much clearance is needed around an air conditioner?
• What is maximum power cord length to a window or wall room air conditioner?
• What is included in an air conditioner inspection by a home inspector?
• Does a wall or window air conditioner need a dedicated circuit?
• Is a range hood exhaust fan required to vent outside?
• Can a water heater and air conditioner use the same drain?
• Does a home inspector determine if an air conditioning system is adequate for a house?
• Does a home inspector test the air conditioning system?
• Can a Type B vent connector be run horizontally?
• What is the correct size breaker for the tons of my heat pump or air conditioner condenser?
• What is an electric heat lock out on a heat pump?
• Can the flexible ducts under a mobile home be on the ground?
• Can the disconnect for an air handler be inside it?
• Can I use a flexible duct for my range hood?
• What are the code requirements for a range hood duct?
• What is the average life expectancy of house a/c and heating ducts?
• How long does a home thermostat last?
• Does my house need a heating system to pass a four point inspection?
• Can an air conditioning condensate drain pipe connect to a sink drain?
• How can I make my Florida air conditioner last longer?
• What is the difference between an upflow, downflow, and horizontal air handler or furnace?
• What is the difference between a fan coil unit (FCU) and an air handling unit (AHU)?
• Does code require a p-trap in an a/c condensate drain?
• Where can a return air opening/register NOT be located by code?
• Why is there a burnt smell when I turn on the heat?
• Why does my air conditioner keep shutting itself off?
• What does an orange or yellow flame at gas furnace mean?
• What is an RTU air conditioner or heat pump?
• Why can't I use duct tape on heating and air conditioning ducts?
• What is the best location for a heat pump condenser (outside unit)?
• What is the best location for a heat pump air handler (indoor unit)?
• Why does my home still feel humid and muggy with the air conditioner on?
• Why are there wires sticking out above the condenser fan motor?
• How close to the property line can I put an air conditioner?
• Why does it say INSTALLATION PROHIBITED IN THE SOUTHWEST on my air conditioner label?
• What is short cycling of an air conditioner or heat pump?
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