Furnace
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The Furnace is your town's headquarters and the first building you construct. Its level gates the maximum level of all other buildings, unlocks new buildings, and determines the amount of heat produced to keep survivors warm.
Overview
The Furnace serves two core functions:
- Power & Progression — Every level increases your total Building Power and unlocks access to higher-level upgrades across all other buildings.
- Heat Production — The Furnace generates heat during the day, night, and snowstorms to prevent survivors from becoming sick. Sick survivors cannot work.
Requirements
Construction times listed are base times and do not account for reductions from State Buffs, Research, or hero skills (e.g. Zinman).
| Level | Prerequisites | Meat | Wood | Coal | Iron | Construction Time | Building Power |
|---|---|---|---|---|---|---|---|
| 1 | — | — | — | — | — | — | 2,000 |
| 2 | Sawmill Lv. 1 | 180 | — | — | — | 00:00:06 | 3,800 |
| 3 | Shelter 1 Lv. 2 | 805 | — | — | — | 00:01:00 | 6,500 |
| 4 | Coal Mine Lv. 3 | 1,800 | — | 360 | — | 00:03:00 | 10,100 |
| 5 | Hero Hall; Shelter 3 Lv. 3 | 7,600 | — | 1,500 | — | 00:10:00 | 15,500 |
| 6 | Iron Mine Lv. 5 | 19,000 | — | 3,800 | 960 | 00:30:00 | 23,600 |
| 7 | Hunter's Hut Lv. 6 | 69,000 | — | 13,000 | 3,400 | 01:00:00 | 35,300 |
| 8 | Infantry Camp Lv. 7 | 120,000 | — | 25,000 | 6,300 | 02:30:00 | 47,000 |
| 9 | Embassy Lv. 8; Infirmary Lv. 1 | 260,000 | — | 52,000 | 13,000 | 04:30:00 | 58,700 |
| 10 | Marksman Camp Lv. 9; Research Center | 460,000 | — | 92,000 | 23,000 | 06:00:00 | 75,700 |
| 11 | Embassy Lv. 10; Lancer Camp Lv. 10 | 1,300,000 | 1,300,000 | 260,000 | 65,000 | 07:30:00 | 92,700 |
| 12 | Embassy Lv. 11; Command Centre Lv. 1 | 1,600,000 | 1,600,000 | 330,000 | 84,000 | 09:00:00 | 109,700 |
| 13 | Embassy Lv. 12; Infantry Camp Lv. 12 | 2,300,000 | 2,300,000 | 470,000 | 110,000 | 11:00:00 | 138,400 |
| 14 | Embassy Lv. 13; Marksman Camp Lv. 13 | 3,100,000 | 3,100,000 | 630,000 | 150,000 | 14:00:00 | 167,100 |
| 15 | Embassy Lv. 14; Lancer Camp Lv. 14 | 4,600,000 | 4,600,000 | 930,000 | 230,000 | 18:00:00 | 195,800 |
| 16 | Embassy Lv. 15; Research Center Lv. 15 | 5,900,000 | 5,900,000 | 1,100,000 | 290,000 | 1d 06:28:00 | 236,200 |
| 17 | Embassy Lv. 16; Infantry Camp Lv. 16 | 9,300,000 | 9,300,000 | 1,800,000 | 460,000 | 1d 12:34:00 | 276,600 |
| 18 | Embassy Lv. 17; Marksman Camp Lv. 17 | 12,000,000 | 12,000,000 | 2,500,000 | 620,000 | 1d 19:53:00 | 317,000 |
| 19 | Embassy Lv. 18; Lancer Camp Lv. 18 | 15,000,000 | 15,000,000 | 3,100,000 | 780,000 | 2d 17:50:00 | 374,400 |
| 20 | Embassy Lv. 19; Research Center Lv. 19 | 21,000,000 | 21,000,000 | 4,300,000 | — | 3d 10:18:00 | 431,800 |
| 21 | Embassy Lv. 20; Infantry Camp Lv. 20 | 27,000,000 | 27,000,000 | 5,400,000 | 1,300,000 | 4d 10:59:00 | 489,200 |
| 22 | Embassy Lv. 21; Marksman Camp Lv. 21 | 36,000,000 | 36,000,000 | 7,200,000 | 1,800,000 | 6d 16:29:00 | 575,300 |
| 23 | Embassy Lv. 22; Lancer Camp Lv. 22 | 44,000,000 | 44,000,000 | 8,900,000 | 2,200,000 | 9d 08:40:00 | 661,400 |
| 24 | Embassy Lv. 23; Research Center Lv. 23 | 60,000,000 | 60,000,000 | 12,000,000 | — | 13d 02:33:00 | 747,500 |
| 25 | Embassy Lv. 24; Infantry Camp Lv. 24 | 81,000,000 | 81,000,000 | 16,000,000 | — | 18d 08:22:00 | 833,600 |
| 26 | Embassy Lv. 25; Marksman Camp Lv. 25 | 100,000,000 | 100,000,000 | 21,000,000 | 5,200,000 | 21d 02:26:00 | 960,100 |
| 27 | Embassy Lv. 26; Lancer Camp Lv. 26 | 140,000,000 | 140,000,000 | 24,000,000 | 7,400,000 | 25d 07:43:00 | 1,086,600 |
| 28 | Embassy Lv. 27; Research Center Lv. 27 | 190,000,000 | 190,000,000 | 39,000,000 | 9,900,000 | 29d 02:52:00 | 1,213,100 |
| 29 | Embassy Lv. 28; Infantry Camp Lv. 28 | 240,000,000 | 240,000,000 | 49,000,000 | 12,000,000 | 33d 11:42:00 | 1,339,600 |
| 30 | Embassy Lv. 29; Marksman Camp Lv. 29 | 300,000,000 | 300,000,000 | 60,000,000 | 15,000,000 | 40d 04:27:00 | 1,523,500 |