Need a fast way to estimate winter heating load without doing a full Manual J? In this short video, we break down simple HVAC rules of thumb (Watt per square foot) so you can quickly size heaters, radiators, or heat pumps for any small project.
In under a minute, you’ll learn:
✅ Base rule of thumb for mild winter regions (20–30 W/sq.ft)
✅ Higher range for cold regions (40–50 W/sq.ft)
✅ Severe winter / very cold climates (60–80 W/sq.ft)
✅ A quick 500 sq.ft example calculated step-by-step
✅ How these numbers help with heater, radiator & heat pump sizing
Perfect for:
HVAC students & junior engineers
Site engineers & technicians
MEP designers who need fast ballpark numbers
Homeowners wanting a rough idea of heater size before talking to a pro
⏱️ Video Breakdown
0:00 – Intro: What is heating load in winter?
0:04 – Rule of thumb for mild winter areas (20–30 W/sq.ft)
0:10 – Rule of thumb for cold regions (40–50 W/sq.ft)
0:16 – Rule of thumb for severe winter (60–80 W/sq.ft)
0:22 – Example: 500 sq.ft × 40 W/sq.ft = 20,000 W (20 kW)
0:32 – Where this rule is useful (heaters, radiators, heat pumps)
0:40 – Outro: More HVAC rules of thumb coming soon
⚠️ Important Note (Disclaimer)
These are approximate rules of thumb for quick estimates only.
For final design, always use proper HVAC load calculations (e.g., Manual J / detailed heat loss calculations), considering insulation, windows, infiltration, orientation, and local code requirements.
👍 If this video helped you:
Like the video to support the channel
Comment which topic you want next (cooling load, CFM rules, tonnage, etc.)
Subscribe & turn on the bell 🔔 for more HVAC rules of thumb and quick design shortcuts
#HVAC #HeatingLoad #HVACDesign #RuleOfThumb #MechanicalEngineering #LoadCalculation #HeatPump #RadiatorSizingNeed a fast way to estimate winter heating load without doing a full Manual J? In this short video, we break down simple HVAC rules of thumb (Watt per square foot) so you can quickly size heaters, radiators, or heat pumps for any small project.
In under a minute, you’ll learn:
✅ Base rule of thumb for mild winter regions (20–30 W/sq.ft)
✅ Higher range for cold regions (40–50 W/sq.ft)
✅ Severe winter / very cold climates (60–80 W/sq.ft)
✅ A quick 500 sq.ft example calculated step-by-step
✅ How these numbers help with heater, radiator & heat pump sizing
Perfect for:
HVAC students & junior engineers
Site engineers & technicians
MEP designers who need fast ballpark numbers
Homeowners wanting a rough idea of heater size before talking to a pro
⏱️ Video Breakdown
0:00 – Intro: What is heating load in winter?
0:04 – Rule of thumb for mild winter areas (20–30 W/sq.ft)
0:10 – Rule of thumb for cold regions (40–50 W/sq.ft)
0:16 – Rule of thumb for severe winter (60–80 W/sq.ft)
0:22 – Example: 500 sq.ft × 40 W/sq.ft = 20,000 W (20 kW)
0:32 – Where this rule is useful (heaters, radiators, heat pumps)
0:40 – Outro: More HVAC rules of thumb coming soon
⚠️ Important Note (Disclaimer)
These are approximate rules of thumb for quick estimates only.
For final design, always use proper HVAC load calculations (e.g., Manual J / detailed heat loss calculations), considering insulation, windows, infiltration, orientation, and local code requirements.
👍 If this video helped you:
Like the video to support the channel
Comment which topic you want next (cooling load, CFM rules, tonnage, etc.)
Subscribe & turn on the bell 🔔 for more HVAC rules of thumb and quick design shortcuts
#HVAC #HeatingLoad #HVACDesign #RuleOfThumb #MechanicalEngineering #LoadCalculation #HeatPump #RadiatorSizing
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