Understand your home. Make better calls about it.
Think of this as the owner's manual your house forgot to come with.
These guides come from real questions homeowners have asked me about heating, air quality and hot water.
I'm Andrew, an HVAC, plumbing and generator tech with a decade in the trades. I still learn something new almost every day. It's out there if you stay curious. This won't replace a local pro. It will help you dodge the costly mistakes and feel a lot more confident making decisions about your home.
New guides and updates are added regularly. Last updated November 2026.
Swipe or scroll sideways to inspect the labels. Open full-size drawing to zoom.
Read the system names and connections
- Furnace
- Evaporator coil
- Supply register
- Return grille
- Filter cabinet
- Thermostat
- Water heater
- Shared flue
- Condenser
- Gas meter
- Breaker panel
- Automatic transfer switch
- Generator
- Smoke and CO alarms
- Attic
- Encapsulated crawlspace
The drawing also labels the supply and return plenums, refrigerant lines and the condensate drain. Its legend identifies supply air, return air, flue gas, natural gas, generator electrical conduit and utility power feed. Ducts and the flue remain separate.
Start here
HVAC
Furnace won't ignite: safe checks before you call
Start with thermostat, power, filter and gas-valve checks.
HVACFurnace blowing cold air: safe checks before you call
Check the fan setting and filter before looking deeper.
HVACThermostat screen blank? Check these in order
Check batteries, power and the float switch in order.
HVACWhat temperature should I set my thermostat to?
Five quick questions, then the numbers to set for home, asleep and away.
HVACSmart thermostats: why ecobee is the pick
How ecobee and Nest run their schedules, and why ecobee is easier to set up and understand.
HVACAir filters: where they are, how to check them, when to change them
Where your furnace and AC filter is, the light test, how often to change it and how to get the right size.
HVACWhat does the MERV number on your filter mean?
Read the rating and check what your system can accept.
Free toolFilterPing
A free filter-change reminder: pick your own interval and add the dates to your calendar.
Plumbing
Home Safety
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Service area
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