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why can my heaters easily keep my house at a nice 75 when its 15 degrees outside, but my AC struggles to dip below 70 when its 100 outside?

Sarah Jenkins
Sarah Jenkins
Lead Content Curator · Mar 11, 2026 · Updated Apr 13, 2026

Your heaters are a hell of a lot more powerful than your Air Conditioners An AC unit can move 4-10 watts of heat per watt of power used, but it'll only use a few hundred watts. A big window AC unit might be rated at 10,000 BTU/hour or about 2.9 kW of heat removal which sounds pretty good, until y…

105
Words

1 min
Read Time

#115
of 500 in Science

+46%
vs Category Avg

The Short Answer

Your heaters are a hell of a lot more powerful than your Air Conditioners An AC unit can move 4-10 watts of heat per watt of power used, but it'll only use a few hundred watts. A big window AC unit might be rated at 10,000 BTU/hour or about 2.9 kW of heat removal which sounds pretty good, until you consider that a 6 foot electric baseboard can be a 1.5 kW heater and you'll likely have significantly more of them than you will air conditioners Your house likely has the ability to add 10 kW of heat to the space but is only able to remove 2-4 kW

Analysis

Key Concepts: Heat, conditioners, unit

This explanation focuses on heat, conditioners, unit and spans 105 words across 2 sentences. At 46% above the average Science explanation (72 words), this is one of the more thorough answers in this category, reflecting the complexity of the underlying question.

What This Answer Covers

This is a focused, single-point answer that gets directly to the core of the question without detours.

How This Compares in Science

Ranked #115 of 500 Science questions by answer depth (top 24%). This places it in the comprehensive tier — the top quarter of most thoroughly answered questions. Questions at this depth typically involve multi-faceted topics requiring nuanced explanation.

Frequently Asked Questions

Is there a simple explanation for why my heaters easily keep my house at a nice 75 when its 15 degrees outside, but my ac struggles to dip below 70 when its 100 outside?

Your heaters are a hell of a lot more powerful than your Air Conditioners An AC unit can move 4-10 watts of heat per watt of power used, but it'll only use a few hundred watts. A big window AC unit might be rated at 10,000 BTU/hour or about 2.9 kW…

How detailed is this explanation compared to similar Science questions?

This is one of the most thorough answer at 105 words, ranked #115 of 500 Science questions by depth. The key concepts covered are heat, conditioners, unit.

What approach does this answer take to explain my heaters easily keep my house at a nice 75 when its 15 deg?

The explanation uses contrasting perspectives across 105 words. It is categorized under Science and addresses the question through 1 analytical lens.