取代CA CZ16（CZ4B/CZ6B）中衰老燃气炉的加热选择
大家好。
我有一个15岁的炉子，它没有得到很好的照顾，并且在最后的腿上即将出现。House是1650平方英尺，有1.5层，带有大教堂天花板，建于73年，空气密封不好：在我们的最后一次鼓风机门测试中，0.6 ACH。正在完成工作以希望将其降低到〜0.4，但我们有一个T＆G屋顶，有一些自然的限制。
I’m not overly worried about summer: the cathedral ceilings have skylights and a large fan mounted under them which do a great job at keeping the place cool. Winter on the other hand gets cold. We’re in CZ16 so nothing crazy but we did hit 0 a couple of times this year.
我只是用另一个高效率的燃气炉代替它，因为管道已经到位，但这是摩擦：炉子位于爬行空间中，它是_Extremely _ terger。从土壤到托梁底部的24英寸。它目前安装在一个水底泵旁边，在以前的所有者任职期间，其管道已经失败了几次，淹没了鼓风机的腔（因此更换了15年。希望解决这个问题，但是空间非常非常紧密。
这使我提出了我的问题：我还有哪些其他选择来加热这座房子不是爬行空间中的炉子？室外热泵/反向周期AC？室外燃气炉？吸收它并付钱给一个大$$在那个紧密的空间中工作并更换它？
GBA细节库
由气候和房屋部分组织的一千个建筑细节的集合
Search and download construction details
Replies
Josh,
有带有“超热”冷凝器的导管迷你拆分热泵。这可能会起作用，但是将任何类型的空气处理程序放在通风的爬行空间中可能不是一个好主意。您会考虑密封爬网（在粉底墙上带有绝缘材料的重型衬里）吗？我用三菱超热代替了类似于您的旧管道系统。由于房屋有两个古怪的区域，因此设计包括两个空气处理程序，一个分支电路控制器和单个三吨室外单元。
这给了我热量和空气，这对于CZ3A至关重要。您在T＆G天花板后面有石膏板吗？
Also... That air leakage rate doesn't sound right. A .6 ACH/50 measurement get you into passive house territory. Maybe you mean 6 ACH/50.
而且...加利福尼亚的气候区域在此网站上没有太多使用。您能查找您的IECC位置吗（https://basc.pnnl.gov/images/iecc-climate-zone-map) and edit your post?
I would love to encapsulate the crawl space but it's so tight everyone has told me that it can't be done and the one company that said it could quoted me $22k, so I'm taking that as a "it probably can't be done right". The existing furnace spent it's life in this ventilated crawlspace that previously did not even have a vapor barrier, with it's air intake pointed down at the air. Optimally any solution I come up with wouldn't involve that crawl space as maintenance down there is a real pain and significantly increases costs. I'll do it if I have to -- and I might with 200" of snow in December alone -- but I'd like to try to avoid it!
楼上是一个A型形状，两端都有一个卧室，中间露出阁楼。炉子努力工作，试图加热大型阁楼和起居空间，这些空间通常会以几乎完美的温度保持楼上的卧室，而该区域永远不会运行。也许这种情况使迷你拆分更有意义：我会更好地看。
T＆G后面没有石膏板。我不完全确定该腔中有什么，但是它在峰附近有一些泄漏，因此，整个洞都少了，这使我认为那里有一个空中屏障。
我认为您在6ach上是正确的。我正在等待书面报告，所以记忆犹新。
Hah.. I said CZ16 because I always struggle to find it on the IECC maps. I live in Lake Tahoe which is probably CZ4 on that map but I live on the edges, so between CZ4B/CZ6B on the map.
天真地感觉我的选择是：
- 更换炉子
- 安装迷你切片，卸下管道（＆也许将爬网空间封装在没有管道的所有额外工作空间中）
- Replace the furnace with an outdoor heat pump/AC and connect up the ducting.
Where is the duct work, under the house, insulated? How do you make your hot water? Where is the heater. Is there an attic, attic insulation?
Duct work is fiberglass insulated flex duct that runs in the crawlspace, hanging from the floor joists (not resting on the ground). Second floor ducting comes up via some chases in closets. Hot water heater is a gas tankless hot water heater mounted to an exterior wall in the corner of the laundry on the first floor (inside).
没有阁楼。25英尺拱形/大教堂的天花板。
一些想法：
建造一个小型添加/独立的锅炉室。在与锅炉连接的房屋中使用空气处理程序，就像它们用于木锅炉一样。也移动热水器吗？空气处理人员和锅炉的许多选择。高价值空气可能是一个不错的选择。
Direct vented gas heaters. In wall furnace, floor furnace, or stand alone heater.
Both ideas gets almost everything out of the crawl space. This will make it easier when you decide to do something to insulate under the floor.
Josh,
您是否考虑过雇用HVAC工程师？我认为这种方法将提供更好，更合适的系统。
Thanks Jonathan, lots to think about.
史蒂夫, absolutely, that's my next step. I just like to try to be informed a little before I hire someone else so I can make best use of their time!
听起来您有一个度假屋，就像我们在这里所说的那样，冬天。我们有很多在1960年代，70年代和80年代进行了升级。现在他们将它们击倒并建立新的。我建议长期计划很重要。您不想做一些妨碍其他事情的事情。
Close! Former vacation home that is now just home... turns out being in the woods really appealed to us :)
Yes, I'm trying to long term plan and that's why getting everything out of the crawlspace (in spite of the higher cost and effort) seems worthwhile to me.
I think I'm going to get a local engineering companies input (they've done some title 24 work for me in the past) and then find some local Mitsubishi experts to see what a dual zone mini-split would look like for me. The appeal of moving the mechanical, perhaps side mounted for snow, outside and freeing up all of the ducting is pretty compelling. Ground coverage here is a no-go: the TRPA prohibit any expanded ground coverage for water management purposes.
由于难以控制此ACH，因此我们可能会在地板上喷涂泡沫，并封装RIM托梁。
感谢所有的输入！
该网站上经常讨论将盖有盖的门廊/三个季节房间转换为完全合并的生活空间。值得搜索您的地板翻新细节。
有什么理由您自己无法挖掘爬网空间吗？
如果您在CZ4中，看来地下的底部将低于级别的36英寸，您将要确保不打扰他们或任何其他负载轴承柱。
Get yourself a short shove and 20 5 gallon buckets and get to work.
Walta
How about excavating a portion of the crawlspace for a conditioned boiler room. They do something like that for coastal homes which are up on tall posts.