<?xml version="1.0"?>
<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en">
		<id>https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&amp;feedformat=atom&amp;user=2607%3AFB90%3A5506%3A362%3AF509%3A8D15%3A5B40%3A42C9</id>
		<title>explain xkcd - User contributions [en]</title>
		<link rel="self" type="application/atom+xml" href="https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&amp;feedformat=atom&amp;user=2607%3AFB90%3A5506%3A362%3AF509%3A8D15%3A5B40%3A42C9"/>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php/Special:Contributions/2607:FB90:5506:362:F509:8D15:5B40:42C9"/>
		<updated>2026-05-01T20:41:12Z</updated>
		<subtitle>User contributions</subtitle>
		<generator>MediaWiki 1.30.0</generator>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3099:_Neighbor-Source_Heat_Pump&amp;diff=379016</id>
		<title>3099: Neighbor-Source Heat Pump</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3099:_Neighbor-Source_Heat_Pump&amp;diff=379016"/>
				<updated>2025-06-07T11:12:46Z</updated>
		
		<summary type="html">&lt;p&gt;2607:FB90:5506:362:F509:8D15:5B40:42C9: /* Explanation */ Removing unnecessary text - this is just a shorter version of everything before it&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 3099&lt;br /&gt;
| date      = June 6, 2025&lt;br /&gt;
| title     = Neighbor-Source Heat Pump&lt;br /&gt;
| image     = neighbor_source_heat_pump_2x.png&lt;br /&gt;
| imagesize = 431x284px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = The installation of the pipes on the inside of the insulation can be challenging, especially when the neighbor could come home at any minute.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|This page was created by A HOT-TEMPERED NEIGHBOUR. Don't remove this notice too soon.}}&lt;br /&gt;
&lt;br /&gt;
Using electricity to heat the home used to involve direct use of {{w|Joule heating|resistive heating}}, but has more recently been replaced by developments in heat-pump technology which, much like the operation of a typical refrigerator, uses a small amount of power to move heat to where it is most needed (away from where the heat is ''not'' required). This is most commonly done using an {{w|air source heat pump}} which can extract heat from the ambient outside air and use that to heat the inside of a household, and its hot-water supply. Because of the varying nature of the external climate, this is less efficient (or at least more technically difficult) in colder weather, the time when the heating would be most appreciated.&lt;br /&gt;
&lt;br /&gt;
An alternate method of harvesting heat is the {{w|ground source heat pump}}. This does the same job of extracting heat energy from ''its'' surroundings (pipes sent deep into the ground, rather than just being exposed to the air by the side of the building), and benefits from the more constant temperature of the pedosphere (or deeper), giving a ''relatively'' warm heat-source, to extract energy from, even in the depths of winter. If set up to also cool the home, it also finds the same small range of ground-temperatures useful in being ''cooler'' than the ambient air of summer, thus being more suited to disperse excess heat into whilst cooling the indoors environment. A further method, the water source heat pump, similarly makes use of a sufficiently large body of water's tendency to provide a near constant 4°C temperature (whatever the external conditions) in its depths.&lt;br /&gt;
&lt;br /&gt;
In this comic, Randall goes further and finds a handy source of heat (in winter) and cold (in summer)… the house of a neighbour, which is itself being actively maintained (perhaps by more traditional heating and cooling technology) at a temperature which approaches his own preference for temperature. Being thermally inverted to the current seasonal conditions, it would be even more economical to tap into for heat during cold times and coolness during the warmer ones. At least it would be for Randall, not the neighbour who is now forced to effectively air-condition ''two'' buildings, instead of the one they thought they were maintaining.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
The title text addresses some of the issues involved when trying to properly install the Neighbour-Source Heat Pump, without the neighbour realising that they are about to be leeched from in this way.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
{{incomplete transcript|Don't remove this notice too soon.}}&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&amp;lt;noinclude&amp;gt;&lt;br /&gt;
&lt;br /&gt;
[[Category:Comics with color]]&lt;/div&gt;</summary>
		<author><name>2607:FB90:5506:362:F509:8D15:5B40:42C9</name></author>	</entry>

	</feed>