Whiteout Survival furnace upgrades: Guide & Tips

Q: What is the max level of the Furnace in Whiteout Survival?

The base maximum level is Level 30. However, after level 30, you unlock Fire Crystal levels (currently up to FC10 in the oldest states), which act as prestige levels.

The Whiteout Survival furnace upgrades are the heart of your progression. By levelling up this central building, you can increase the temperature of your town, unlock new buildings and ensure the health of your survivors. Always prioritise the power level to withstand snowstorms.

This Whiteout Survival guide is up to date with the latest version of the game (Version 1.29.20. 12/21/2025).

Contents view

Why is the Furnace your City's Heart?

In Whiteout Survival, the furnace serves two critical roles for your progression:

It controls the Temperature (Survival Rating): A higher level furnace keeps survivors warm during the day, night, and blizzards. If the temperature drops too low, survivors fall ill and stop working, halting your resource production.
It is the Key "Bottleneck": You literally cannot progress without it. The Furnace level dictates the max level of all other buildings (Heroes Hall, Infirmary, Embassy).

Whiteout Survival Furnace Upgrade Requirements

Upgrading your furnace is a marathon, not a sprint. Reaching Level 30 and beyond (Fire Crystals) takes time. Here is the strategy to manage the huge resource costs.

1. Resource Management (The "Big 4")

Before starting an upgrade, ensure your production buildings are maxed out. You will need massive amounts of:

Meat: For food and upgrades starting at Level 11.
Wood: The most consumed resource early game.
Coal: Vital to keep the furnace running while upgrading.
Iron: Required from Level 6 onwards.

2. Reducing Construction Time

Construction time grows exponentially (up to 40 days for level 30!). You must use General Speedups and Construction Speedups found in daily missions and events.

Using construction speedups in Whiteout Survival

Mobi.gg Pro Tip: Never start a long upgrade without an active Alliance! Your allies can press the "Help" button to reduce your timer significantly. Upgrade your Embassy to increase the number of times you can be helped.

Furnace upgrade conditions

You can upgrade the furnace up to level 30, which is the maximum level. Below is a detailed list of all the Whiteout Survival furnace upgrade requirements for all 30 levels. If you need any further advice, don't hesitate to consult the Whiteout Survival beginner's guide!

Level	Upgrade materials	Time	Items unlocked
1	-	-	Shelter 1 Shelter 2 Sawmill Cooking chamber
2	Sawmill: Level 1 Wood required: 800	6 seconds	Hunter's hut
3	Shelter 1: Level 2 Wood required: 805	1 minute	Coal mine
4	Coal mine: Level 3 Wood required: 1,800 Coal required: 360	3 minutes	Shelter 3 Heroes' room Explorer's hut Clinic
5	Shelter 3: Level 3 Heroes' room: Level 1 Wood needed: 7,600 Coal required: 1,500	10 minutes	Shelter 4 Iron mine
6	Iron mine: Level 5 Wood required: 19,000 Coal required: 3,800 Iron required: 960	30 minutes	Shelter 5 Chief's house
7	Hunter's hut: Level 6 Wood needed: 69,000 Coal required: 25,000 Iron needed: 3,400	1 hour	Shelter 6 Infantry camp Barricade Lighthouse
8	Infantry camp: Level 7 Wood required: 120,000 Coal required: 25,000 Iron needed: 6,300	2 hours 30 minutes	Embassy Marksmen's camp Infirmary Arena
9	Infirmary: Level 1 Embassy: Level 8 Wood needed: 260,000 Coal needed: 52,000 Iron needed: 13,000	4 hours 30 minutes	Research centre Lancers' camp Warehouse
10	Research centre: Level 1 Marksman's camp: Level 9 Wood required: 460,000 Coal required: 92,000 Iron needed: 23,000	6 hours	Shelter 7 Shelter 8 Command centre
11	Camp for lancers: Level 10 Embassy: Level 10 Wood required: 1,300,000 Coal required: 260,000 Iron needed: 65,000 Meat required: 1,300,000	7 hours 30 minutes	Enrolment office
12	Command centre: Level 1 Embassy: Level 11 Wood required: 1,600,000 Coal required: 330,000 Iron needed: 84,000 Meat required: 1,600,000	9 hours	-
13	Infantry Camp: Level 12 Embassy: Level 12 Wood needed: 2,300,000 Coal required: 470,000 Iron needed: 110,000 Meat required: 2,300,000	11 hours	Drilling camp
14	Marksman's camp: Level 13 Embassy: Level 13 Wood needed: 3,100,000 Coal required: 640,000 Iron needed: 150,000 Meat required: 3,100,000	14 hours	-
15	Lancer's Camp: Level 14 Embassy level: Level 14 Wood needed: 4,600,000 Coal needed: 930,000 Iron needed: 230,000 Meat requirements: 4,600,000	18 hours	Hero's equipment
16	Research Centre: Level 15 Embassy: Level 15 Wood needed: 5,900,000 Coal required: 1,100,000 Iron needed: 290,000 Meat required: 5,900,000	1 day 6 hours 28 minutes	-
17	Infantry Camp: Level 16 Embassy: Level 16 Wood needed: 9,300,000 Coal required: 1,800,000 Iron needed: 460,000 Meat required: 9,300,000	1 day 12 hours 34 minutes	-
18	Marksman's Camp: Level 17 Embassy: Level 17 Wood needed: 12,000,000 Coal needed: 2,500,000 Iron needed: 620,000 Meat required: 12,000,000	1 day 19 hours 53 minutes	Cage for wild animals
19	Lancer's Camp: Level 18 Embassy: Level 18 Wood needed: 15,000,000 Coal needed: 3,100,000 Iron needed: 780,000 Meat required: 15,000,000	2 days 17 hours 50 minutes	-
20	Research centre: Level 19 Embassy: Level 20 Wood needed: 21,000,000 Coal required: 5,400,000 Iron needed: 1,000,000 Meat required: 21,000,000	3 days 10 hours 18 minutes	Mastery of the forge
21	Infantry Camp: Level 20 Embassy: Level 20 Wood needed: 27,000,000 Coal needed: 5,400,000 Iron needed: 1,300,000 Meat required: 27,000,000	4 days 10 hours 59 minutes	-
22	Marksman's Camp: Level 21 Embassy: Level 21 Wood needed: 36,000,000 Coal needed: 7,200,000 Iron needed: 1,800,000 Meat required: 36,000,000	6 days 16 hours 29 minutes	Chef's equipment
23	Lancer's Camp: Level 22 Embassy: Level 22 Wood needed: 44,000,000 Coal required: 8,900,000 Iron needed: 2,200,000 Meat required: 44,000,000	9 days 8 hours 40 minutes	-
24	Research centre: Level 23 Embassy: Level 23 Wood needed: 60,000,000 Coal required: 12,000,000 Iron needed: 3,000,000 Meat required: 60,000,000	13 days 2 hours 33 minutes	-
25	Infantry Camp: Level 24 Embassy: Level 24 Wood needed: 81,000,000 Coal required: 16,000,000 Iron needed: 4,000,000 Meat required: 81,000,000	18 days 8 hours 22 minutes	Chef's equipment charms
26	Marksman's Camp: Level 25 Embassy: Level 25 Wood needed: 100,000,000 Coal needed: 21,000,000 Iron needed: 5,200,000 Meat required: 100,000,000	21 days 2 hours 26 minutes	-
27	Lancer's Camp: Level 26 Embassy: Level 26 Wood needed: 140,000,000 Coal needed: 24,000,000 Iron needed: 7,400,000 Meat required: 140,000,000	25 days 7 hours 43 minutes	-
28	Research centre: Level 27 Embassy: Level 27 Wood needed: 190,000,000 Coal required: 39,000,000 Iron needed: 9,900,000 Meat requirements: 190,000,000	29 days 2 hours 52 minutes	-
29	Infantry Camp: Level 28 Embassy: Level 28 Wood needed: 240,000,000 Coal required: 49,000,000 Iron needed: 12,000,000 Meat required: 240,000,000	33 days 11 hours 42 minutes	-
30	Marksman's Camp: Level 29 Embassy: Level 29 Wood needed: 300,000,000 Coal needed: 60,000,000 Iron needed: 15,000,000 Meat required: 300,000,000	40 days 4 hours 27 minutes	Fire crystal improvements

What happens after Level 30? (Fire Crystals)

Once you reach Furnace Level 30, the game isn't over. You unlock the Fire Crystal levels (FC1 to FC5), and later FC 6-10 in older states. These upgrades no longer use standard resources but require Fire Crystals, a rare red currency obtained through Intel Missions, Arena shops, and events like Castle Battle. Prioritize these as they give massive stat boosts to your troops.

Expert tips for optimising your furnace

Night Mode is a Myth (Kind of): Always run your furnace at maximum power settings. While it consumes more coal, the risk of survivors falling ill due to a sudden temperature drop overnight isn't worth saving a few pieces of coal. After level 20, coal production easily outpaces consumption.
Research "Construction Speed": Before boosting your Furnace, go to the Research Center. In the "Growth" tree, max out the "Tool Improvement" and "Construction Technology" tech. This can shave off days from your upgrade timer.

Mobi.gg's advice : A common mistake is upgrading the Furnace while ignoring Dormitories. If your population cap increases but you have no beds, new survivors will die in the cold. Keep Dormitories only 1 or 2 levels behind your Furnace.

By implementing these strategies, you can complete the furnace upgrade requirements in Whiteout Survival much more quickly. This will allow you to unlock new content and increase shelter for new survivors.

FAQ Whiteout Survival furnace upgrade requirements

What is the max level of the Furnace in Whiteout Survival?

The base maximum level is Level 30. However, after level 30, you unlock Fire Crystal levels (currently up to FC10 in the oldest states), which act as prestige levels.